Technical Memorandum

Modified Flows 2020, Upper Snake River Basin

Columbia Pacific Northwest Region

U.S. Department of the Interior October 2020

Mission Statements The Department of the Interior conserves and manages the Nation’s natural resources and cultural heritage for the benefit and enjoyment of the American people, provides scientific and other information about natural resources and natural hazards to address societal challenges and create opportunities for the American people, and honors the Nation’s trust responsibilities or special commitments to American Indians, Alaska Natives, and affiliated island communities to help them prosper.

The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public.

Table of Contents

Acronyms and Abbreviations ...... iii 1. Introduction ...... 1 1.1. Reclamation Modified Flows Process ...... 1 1.2. Differences from Modified Flows 2010 ...... 2 2. Unregulated Flow Dataset Development...... 4 2.1. Unregulated Flows Methodology...... 4 2.2. Groundwater ...... 5 2.3. Unregulated Flows in the Upper Snake ...... 5 3. Modified Flow Dataset Development ...... 8 3.1. Reference RiverWare Model...... 8 3.2. Irrigation Demand Pattern ...... 12 3.3. Current Level of Groundwater Pumping and Return Flows ...... 15 3.4. Upper Snake River Operation ...... 17 3.5. 2020 Modified Flows in the Upper Snake...... 17 4. Discussion...... 18 5. Summary ...... 22 6. Literature Cited...... 23

List of Figures

Figure 1. Upper Snake River, including the Boise and Payette River basins ...... 3 Figure 2. Selected unregulated flows for the different gages in the Upper Snake on a daily (blue) and monthly (orange) time step ...... 6 Figure 3. Schematic of RiverWare representation of the Upper Snake River ...... 9 Figure 4. Schematic of RiverWare representation of the Boise and Payette Rivers ...... 10 Figure 5. Schematic of RiverWare representation of Henrys Fork of the Upper Snake River...... 11 Figure 6. Annual irrigation demand diversion patterns for the sum of all the water users for each of the subbasins (Boise (BOI), Payette (PAY) and Upper Snake (SNK)) that are repeated for every dry, average, and wet year in the model simulations ...... 15

Modified Flows 2020 – Upper Snak e River Basin i

Figure 7. The total annual groundwater pumping pattern removed as reach losses throughout the Upper Snake...... 16 Figure 8. 2020 Modified Flows data set for BRN for water years 1928 to 2018 ...... 17 Figure 9. Total annual demand for the Snake, Boise, and Payette subbasins from 1994 to 2017 ...... 18 Figure 10. 2020 Modified Flows monthly data set compared with the 2010 Modified Flows data set for water years 1999 to 2018 ...... 20 Figure 11. 2020 Modified Flows daily data set compared with the actual flows at BRN for water years 2009 to 2018 ...... 21

List of Tables Table 1. Comparison of the Brownlee 2020 Unregulated Flows dataset to the 2010 Unregulated Flows dataset for years 1999 to 2008 (the last 10 years of overlap). All volumes are in acre-feet...... 7 Table 2. Years used to create wet, average, and dry patterns for the different basins...... 12 Table 3. Total annual demand for the dry, average, and wet year patterns used in modeling ...... 13 Table 4. Comparison of the 2020 Modified Flows dataset to the 2010 Modified Flows dataset for years 1999 to 2008 (the last 10 years of overlap). All volumes are in acre-feet...... 19 Table 5. Comparison of the 2020 Modified Flows dataset to measured inflows into Brownlee Dam (BRN) for years 2009 to 2018. All volumes are in acre- feet...... 19

ii Modified Flows 2020 – Upper Deschutes Basin

Acronyms and Abbreviations

Acronym or Definition Abbreviation AF Acre-feet AMFI Snake River at Neeley American Falls Inflow ANDI South Fork Boise River at Anderson Ranch ANTI Henrys Fork at St. Anthony, Idaho ARKI Boise River Arrowrock Inflow BIGI Boise River at Glenwood Bridge near Boise, Idaho BFTI Snake River near Blackfoot, Idaho BLFI Blackfoot River near Blackfoot, Idaho BOI Boise River Subbasin BOMI Boise River near Middleton, ID BPA Bonneville Power Administration BRN Snake River at Brownlee Dam Inflow BSHI Blackfoot River near Shelley, Idaho BTSI Boise River near Twin Springs, Idaho (TwSp) Buhl Snake River near Buhl, Idaho cfs Cubic feet per second CHEI Falls River near Chester, Idaho Corps U.S. Army Corps of Engineers CSCI North Fork Payette River Cascade Dam Inflow DEDI Deadwood River Deadwood Reservoir Inflow DGGI Teton River above South Leigh Creek EMMI Payette River Black Canyon Reservoir Inflow FALI Falls River near Squirrel, Idaho GRS Grassy Lake Inflow HENI Henrys Lake Inflow HEII Snake River near Heise, Idaho HFAI Henrys Fork near Ashton, Idaho HRSI Payette River near Horseshoe Bend, Idaho IDWR Idaho Department of Water Resources ISLI Henrys Fork near Island Park, Idaho Island Park Inflow JCKY Jackson Lake Inflow

Modified Flows 2020 – Upper Snake River Basin iii

Acronym or Definition Abbreviation JKSY Snake River below Flat Creek near Jackson, Wyoming KIMI Snake River near Kimberly, Idaho LUCI Boise River Lucky Peak Inflow MILI Snake River at Milner, Idaho MINI Snake River near Minidoka, Idaho OWYI Lake Owyhee and Owyhee River near Nyssa, Oregon PABI North Fork Payette River near Banks, Idaho PALI Snake River near Irwin Palisades Inflow PARI Boise River near Parma, Idaho PAY Payette River Subbasin PAYI North Fork Payette River at McCall PLEI Payette River near Leatha, Idaho PRLI South Fork Payette River at Lowman, Idaho PRPI Payette River near Payette, Idaho Reclamation Bureau of Reclamation REXI Henrys Fork near Rexburg, Idaho RIRI Willow Creek below Ririe Dam Ririe Dam Inflow SHYI Snake River near Shelley, Idaho SKHI Snake River at King Hill, Idaho SNK Upper Snake River Subbasin SnkblwSalmon Snake River below Lower Salmon Falls near Hagerman, Idaho SWAI Snake River near Murphy, Idaho TEAI Teton River near St. Anthony, Idaho TRXI Teton River at mouth VALO Malheur River below Nevada Dam near Vale, Oregon (Malheur) WEII Snake River near Weiser, Idaho WFWI Willow Creek at mouth near Idaho Falls, Idaho WRCC Western Regional Climate Center

iv Modified Flows 2020 – Upper Snake River Basin

1. Introduction

Modified Flows, as computed by the Bureau of Reclamation (Reclamation), are the historical unregulated streamflows from 1928 through 2018 adjusted to reflect what would have occurred with 2020 level reservoir regulation and 2020 level demands. Reclamation produces these flows for the Deschutes, Upper Snake, and Yakima river systems and provides the data to Bonneville Power Administration (BPA) for use in Columbia River System models.

The Modified Flows produced by Reclamation are different from the Modified Flows produced by the U.S. Army Corps of Engineers (Corps) and BPA for other parts of the Columbia System. For inputs other than from the Deschutes, Upper Snake, and Yakima, the Corps and BPA use streamflows that would have been observed if current irrigation depletions (as of year 2018) existed in the past and if the effects of river regulation were removed; for these locations, these flows are also termed Modified Flows. Stated another way, Modified Flows from the Corps and BPA differ from those produced by Reclamation in that the Corps/BPA Modified Flows are unregulated and Reclamation’s are regulated; both sets are adjusted for the influence of irrigation.

Modified Flows quantified in the Pacific Northwest by the Corps, BPA and Reclamation are used together as baseline streamflows for analysis of future conditions, such as changes to the Federal Columbia River Power System due to operational or climatic changes.

This report describes the data, models, and processes that were used to develop the 2020 level Modified Streamflows for the Upper Snake River. Figure 1 shows a map of the basin and the included tributaries.

1.1. Reclamation Modified Flows Process

Modified Flows in the Deschutes, Upper Snake, and Yakima river basins are generated using the generalized process outlined below.

1. Unregulated reach gains/losses in the basin are developed using measured historical data. Unregulated flows at gaged locations are developed using these reach gains/losses. 2. A demand pattern for each diversion location is developed to represent current level conditions. 3. The regulation model is updated to include current level reservoir operations. 4. The unregulated reach gains/losses are input into the model along with the current level demand pattern. The output is the Modified Flows dataset.

The details of this process for the Upper Snake basin are described in this document.

Modified Flows 2020 – Upper Snak e River Basin 1

1.2. Differences from Modified Flows 2010

The Modified Flows produced in 2020 used improved modeling tools and processes from the 2010 study (Modified Flows 2010) and therefore resulted in differences between the two datasets. Modified Flows 2010 were developed using a monthly timestep in the MODSIM platform. Between the publication of Modified Flows 2010 and this study, Reclamation developed a new daily timestep model for the Upper Snake River Basin using RiverWare. MODSIM and RiverWare are configured differently in the way that they solve for reservoir releases in the Upper Snake basin. MODSIM uses elevation targets that, depending on the time of year, can account for releases for flood risk management, irrigation, and other releases, whereas RiverWare uses rule curves with forecasted runoff and other logic to determine the release. These differences, combined with the change from a monthly to daily timestep, resulted in a change in timing of reservoir releases, particularly in the spring months where the RiverWare model more accurately represented releases for flood risk management.

Another difference between the two studies is the approach for calculating the influence of groundwater on unregulated and regulated streamflow. The 2010 study incorrectly assumed that all of the water diverted from the stream eventually returned to the river in the form of groundwater return flows, rather than having a portion be consumptively used. This resulted in too much water being removed from the river in the unregulated flows (as historical return flows are subtracted from unregulated flows) and too much being added in in the regulated flows (as current level return flows are added back to the regulated flows). Because these two calculations are the inverse of each other (the quantity is subtracted in the unregulated calculation and added back to the regulated flows), and because both had the incorrect assumption of zero consumptive use, the effect in the 2010 Modified Flows regulated dataset was minimized, particularly in later years where the historical effect would have been at the current conditions level. However, the unregulated flows were underestimated by as much as 10 percent annually.

2 Modified Flows 2020 – Upper Snake River Basin

Figure 1. Upper Snake River, including the Boise and Payette River basins

Modified Flows 2020 – Upper Snak e River Basin 3

2. Unregulated Flow Dataset Development

Unregulated flows are the basis for any water resources modeling study because they describe the flow in the system without any influence from regulation activities such as reservoir operation, diversion from the river, or return flow from irrigation activities. The intent of developing unregulated flows is to estimate the natural inflows to the system using measured data from the regulated system.

2.1. Unregulated Flows Methodology

Unregulated flows were calculated by first calculating reach gains and losses based on mass balance equations that assume that water can neither be created nor destroyed. Equation 1 is the generalized equation that is used to calculate gains/losses to a river reach that contains a reservoir, where g/l is calculated gains and losses, i is measured inflow, o is measured outflow, d is measured diversion, r is calculated return flows, e is reservoir evaporation, s is reservoir seepage, p is groundwater pumping and ∆s is the change in reservoir storage.

/ = + + + + + Equation 1

Equation 2 is the generalized equation𝑔𝑔 𝑙𝑙 𝑜𝑜that is −𝑖𝑖 used𝑑𝑑 to −𝑟𝑟 calculate𝑒𝑒 𝑠𝑠 gains/lo𝑝𝑝 ∆𝑠𝑠sses to a river reach without a reservoir.

/ = + + Equation 2

The reach gains and losses are then𝑔𝑔 𝑙𝑙 summed𝑜𝑜 −𝑖𝑖 at𝑑𝑑 gage locations −𝑟𝑟 𝑝𝑝 to calculate the unregulated flows. A detailed methodology for determining unregulated reach gains and losses can be found in a separate Reclamation report1 (Reclamation 2017). The equations used to calculate the unregulated gains and losses are presented in Appendix A and Appendix B of this document.

For the Upper Snake River, a daily MODSIM model was used to calculate the gains, losses, and unregulated flows. The MODSIM model uses the equations described above with measured regulated flow data.

This study included an additional step where reach gains and losses were quality controlled before being summed in to unregulated flows. This was done by examining the gains and losses for outliers caused by missing data or gage measurement errors; such errors could have been caused by many factors, including high flows, wind, and lack of accurate daily data before 1980. Negative outliers were often followed by positive outliers within days when the gage corrected itself and vice versa. These paired negative-positive outliers (greater than approximately 4,000 cubic feet per second (cfs)) were smoothed out while still conserving the amount of water flowing through each gage.

1 The referenced document is focused on the Deschutes basin, but the Snake basin uses the same processes for calculating gains and losses.

4 Modified Flows 2020 – Upper Snake River Basin

2.2. Groundwater

When water is applied to irrigated lands, excess water can seep below the root zone and travel, via the aquifer, back to the river. The time it takes for that water to return to the river is described by a time-dependent function known as a groundwater response function. Response functions are also used to describe the lagged effect on the river due to pumping water from the aquifer. The response functions for the Upper Snake model were calculated using a groundwater model of the basin (IDWR 2013). In addition, the groundwater model describes where the water returns to the system and these locations are incorporated into the MODSIM unregulation model.

For the 2020 Modified Flows study, the historical effects of groundwater were removed from the gains and losses using historical diversion rates and the response functions. This is different than the approach taken for the 2010 Modified Flows study, where the historical influence of groundwater was left in the gains/losses; it was later removed when the regulated flows were calculated.

2.3. Unregulated Flows in the Upper Snake

Unregulated flows in the Upper Snake basin were calculated at a daily timestep for the period of October 1928 through September 2018. Figure 2 shows the time series of the daily unregulated flows for selected gage locations in the Upper Snake basin (blue dashed). Monthly average flows were calculated from the daily time series, and the plots show how much the variability was smoothed by the averaging process. The day-to-day variability is larger than the monthly average variability, which can be partly attributed to daily weather events. This can be especially true on reaches with reservoirs where wind and wave activity from boats on the reservoirs can cause changes to the daily measured forebay elevations; small changes in forebay elevation can translate into large variation in storage2.

2 Reservoir storage is computed from measured forebay elevations.

Modified Flows 2020 – Upper Snak e River Basin 5

Figure 2. Selected unregulated flows for the different gages in the Upper Snake on a daily (blue) and monthly (orange) time step

6 Modified Flows 2020 – Upper Snake River Basin

Compared to unregulated flows at Brownlee from 2010 (Reclamation 2010; BPA 2011), the 2020 unregulated flows are higher. The differences in annual volume and peaks for 1999 through 2008 (the last ten years of overlap in the two datasets) are presented in Table 1. The annual volumes for the 2020 dataset are ten percent higher than the 2010 dataset on average, largely due to the groundwater calculation discussed in Section 2.2. The maximum monthly volumes for 2020 are 1 percent higher than the 2010 dataset average, since flood peaks are not notably influenced by groundwater. The minimum monthly volumes are 23 percent higher than the 2010 dataset, where the groundwater effects are most pronounced. As described in Section 1.2, this difference is largely due to too much water being removed from the river when subtracting the influence of groundwater return flows in the 2010 Modified Flows study.

Table 1. Comparison of the Brownlee 2020 Unregulated Flows dataset to the 2010 Unregulated Flows dataset for years 1999 to 2008 (the last 10 years of overlap). All volumes are in acre-feet.

Maximum Monthly Minimum Monthly Annual Volume Year Volume Volume 2020 2010 2020 2010 2020 2010 1999 26,095,713 23,806,645 5,120,911 4,923,979 1,149,840 900,727 2000 19,432,475 17,551,353 3,351,271 3,212,959 964,230 806,483 2001 13,449,658 11,549,216 2,154,087 2,113,360 767,176 571,069 2002 16,001,081 13,938,439 2,697,309 2,528,530 807,295 638,497 2003 16,102,551 14,379,502 3,098,911 2,888,299 784,264 634,684 2004 16,066,845 14,118,924 2,517,232 2,424,676 824,421 626,647 2005 15,985,499 14,658,107 3,512,038 3,712,983 801,510 620,415 2006 25,026,981 22,972,314 5,481,723 5.601,418 946,861 637,144 2007 14,793,127 13,383,347 2,410,413 2,545,562 750,961 562,435 2008 19,015,332 16,902,094 3,867,369 3,766,908 938,304 716,385 Averages 18,196,926 16,325,994 3,421,126 3,371,867 873,486 716,385 % Difference 10% -- 1% -- 23% -- vs. 2010

Modified Flows 2020 – Upper Snak e River Basin 7

3. Modified Flow Dataset Development

Modified Flows are flows that represent 2020 level reservoir operations and irrigation demand levels throughout the period of record, 1928 through 2018. The Upper Snake RiverWare model was used to develop the Modified Flows dataset from 1928 through 2018.

3.1. Reference RiverWare Model

The water resources modeling for the 2020 Modified Flows study was conducted using a daily timestep RiverWare (Reclamation 2020) model of the Upper Snake River basin above Brownlee Reservoir. A short summary of the model is presented in this section. A complete description of the model development is provided in a separate document (Reclamation 2020).

The RiverWare model represents the Upper Snake River down to Brownlee Reservoir. It explicitly models operations in the Upper Snake above Milner, Boise River, and Payette River (Figure 1). Other tributaries, such as the Owyhee, are represented as inflow nodes.

RiverWare is a general rules-based modeling platform that requires full definition of the physical layout of a river system and logic to define operation of the system. The model is constructed using RiverWare objects that define reservoirs, diversions, river reaches, and river gages. Figure 3, Figure 4, and Figure 5 diagram the layout of the RiverWare model for the Upper Snake River, the Boise and Payette Rivers, and the Henrys Fork of the Snake River subbasins, respectively. The red circles indicate water users (representing diversions) and are labeled with the river reach or water user acronym that they serve. The orange boxes indicate stream gages and are named with their four- letter acronym from the Hydromet program (https://www.usbr.gov/pn/hydromet/), with the exception of a few USGS gages (Appendix B). The green triangles represent locations where gains and losses are input into the model. The model itself includes significantly more detail than these schematics, but the figures illustrate the most relevant features of the model.

8 Modified Flows 2020 – Upper Snake River Basin

Figure 3. Schematic of RiverWare representation of the Upper Snake River

Modified Flows 2020 – Upper Snak e River Basin 9

Figure 4. Schematic of RiverWare representation of the Boise and Payette Rivers

10 Modified Flows 2020 – Upper Snake River Basin

Figure 5. Schematic of RiverWare representation of Henrys Fork of the Upper Snake River Operating rule logic was first developed to simulate historical operations from 1994 through 2006, the years in which measured data could be compared to model output to ensure proper operation. The model used water rights, diversion patterns, and inflow hydrology representative of the time period. Detailed information about the inputs and calibration quality is provided in a separate report describing model development (Reclamation 2020).

Modified Flows 2020 – Upper Snak e River Basin 11

It is important to recognize that there are many assumptions and simplifications that are required when developing a model. The data and operating logic attempt to simulate realistic conditions and water management as closely as possible, but it is likely there will be some operations that are handled differently in real time.

3.2. Irrigation Demand Pattern

The Modified Flows study is designed to represent the response of a system using the current operational rules and demand levels. Demands were changed from the historical daily time series that varies from year to year to categorized dry, average, and wet year weekly patterns that represent average irrigation diversions calculated from measured data for recent years (2009 through 2018). Though the model is run at a daily timestep, demands change weekly to be more representative of real-world operations.

For the Upper Snake, Boise, and Payette, dry and wet years were categorized as the 25th and 75th percentile annual runoff for the entire record (1928 through 2018). Table 2 shows the years used to create the wet, average, and dry demand patterns using diversion data from recent years (2009 through 2018) as they were categorized using the entire runoff period (1928 through 2018). Table 3 shows the total average annual volume for each dry, average, and wet year pattern for reaches of the river and major canals. Figure 6 shows the sum of the weekly diversion patterns that is repeated every wet, average, and dry year for the model simulation period for the Boise, Payette, and Upper Snake subbasins. Diversions for other small tributary basins or below Milner were imbedded in the unregulated flows and not adjusted for current conditions. These diversions are small relative to the rest of the basin and therefore the effect is considered negligible.

Table 2. Years used to create wet, average, and dry patterns for the different basins

Basin Wet Years Average Years Dry Years

Upper Snake 2009, 2011, 2017, 2010, 2012, 2014, 2013 2018 2015, 2016

Boise River 2017 2009, 2010, 2011, 2013, 2014, 2015 2012, 2016, 2018

Payette 2011, 2017 2009, 2010, 2012, 2013, 2015 River 2014, 2018

12 Modified Flows 2020 – Upper Snake River Basin

Table 3. Total annual demand for the dry, average, and wet year patterns used in modeling

Total Annual Demand (acre-feet) River Reach or Canal Wet Average Dry Snake River Reach3Diversions_SNK 12,016 9,836 9,242 Snake River Reach4Diversions_SNK 1,184,432 1,169,773 1,076,131 Snake River Reach5Diversions_SNK 434,014 486,374 481,608 Snake River Reach6Diversions_SNK 742,232 823,956 749,180 Snake River Reach7Diversions_SNK 50,668 67,828 68,747 Snake River Reach8Diversions_SNK 589,018 614,628 647,466 Snake River Reach9Diversions_SNK 2,766,151 2,744,869 2,744,733 Snake River Reach10Diversions_SNK 222,359 233,087 213,201 Snake River Reach13Diversions_SNK 935 1,510 1,818 Snake River Reach16Diversions_SNK 132,970 131,938 118,886 Snake River Reach17Diversions_SNK 253,732 243,364 228,863 Snake River Reach18Diversions_SNK 17,441 27,238 28,449 Snake River Reach19Diversions_SNK 192,445 197,738 177,851 Snake River Reach21Diversions_SNK 9 15 29 Snake River Reach22Diversions_SNK 45,756 47,650 43,921 Snake River Reach23Diversions_SNK 73 195 265 Snake River Reach25Diversions_SNK 201,419 210,212 189,042 Snake River Reach30Diversions_SNK 7,108 6,845 4,677 Snake River Reach31Diversions_SNK 150,631 162,595 152,722 Snake River Reach32Diversions_SNK 188,511 192,377 181,422 Snake River Reach36Diversions_SNK 76,598 76,925 73,773 Snake River Reach47Diversions_SNK 14,187 11,922 11,524 Snake River Eagle_Rk 187,165 206,683 208,196 Snake River CXCI 68,973 77,969 86,088 Snake River Fall_R_C 28,489 38,534 38,356 Snake River Reservation 62,104 128,551 123,354 Payette River Reach8Diversions_PAY 429,895 458,291 484,311 Payette River Reach9Diversions_PAY 219,998 229,527 238,196 Payette River Reach10Diversions_PAY 136,159 156,237 171,886 Payette River Reach12Diversions_PAY 87,250 84,803 92,355

Modified Flows 2020 – Upper Snak e River Basin 13

Total Annual Demand (acre-feet) River Reach or Canal Wet Average Dry Payette River Reach13Diversions_PAY 3,449 4,028 4,179 Payette River SevenMileSloughAtHead 113,633 113,134 115,568 Boise River Reach5Diversions_BOI 181 131 145 Boise River Reach6LowerDiversions_BOI 6 4 3 Boise River Reach6UpperDiversions_BOI 133 117 26 Boise River Reach7Diversions_BOI 790,538 782,178 661,916 Boise River Reach8Diversions_BOI 158,118 171,913 150,849 Boise River Reach9Diversions_BOI 123,723 126,977 109,550 Boise River Reach10Diversions_BOI 230,449 235,655 219,184 Boise River Reach11Diversions_BOI 177,189 197,771 168,747 Boise River Reach12Diversions_BOI 56,785 62,285 58,619 Boise River Reach13Diversions_BOI 39,722 62,991 52,065

14 Modified Flows 2020 – Upper Snake River Basin

Figure 6. Annual irrigation demand diversion patterns for the sum of all the water users for each of the subbasins (Boise (BOI), Payette (PAY) and Upper Snake (SNK)) that are repeated for every dry, average, and wet year in the model simulations

3.3. Current Level of Groundwater Pumping and Return Flows

For the Modified Flows analysis, the model simulated groundwater responses based on 2020 level demands. In the Upper Snake basin (excluding Boise and Payette subbasins), it can take up to 50 years for the system to equilibrate with respect to groundwater responses based on simulated response functions.

Return flows are excess irrigation water from both surface and groundwater sources that seeps below the root zone and travel, via the aquifer, back to the river. Return flows can be estimated

Modified Flows 2020 – Upper Snak e River Basin 15

using the total surface water diversion (div), total pumped water applied to lands (pump), and evapotranspiration (ET) (Equation 3).

= + Equation 3

Current level return flows are calculated𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟 𝑓𝑓 using𝑓𝑓𝑓𝑓𝑓𝑓𝑓𝑓 Equation𝑑𝑑𝑑𝑑𝑑𝑑 𝑝𝑝3 𝑝𝑝and𝑝𝑝𝑝𝑝 estimates− 𝐸𝐸𝐸𝐸 of the water budget components for the Upper Snake River as calculated by IDWR (IDWR 2013) for 1981 through 20083, where div average 7.4 4 million acre-feet per year, pump averages 2 million acre-feet per year, and ET averages 6 million acre-feet per year. The return flows for the Upper Snake River are approximately 3.4 million acre-feet of water.

Groundwater pumping for irrigation removes approximately 2 million acre-feet of water in the Upper Snake per year. Subtracting this from the current level return flows gives a net groundwater return flow of 1.4 million acre-feet per year. In other words, the impact of groundwater return flow and groundwater pumping on the Upper Snake River is 1.4 million acre-feet per year.

Both gains from return flows and losses from groundwater pumping are represented in the RiverWare model. In order to account for the gain of groundwater flowing into the river at certain locations, response functions representing returns from irrigation locations were input directly into the RiverWare model. The most recent 50-year pre-routed return flows which allowed for equilibrium conditions were input into the RiverWare model 50 years prior to the start date. This allows the response functions to accurately calculate return flows for the early period of the model.

In order to account for the loss of groundwater flowing into the river at certain locations, response functions representing locations where water is pumped were used to estimate a yearly pattern of removal of water outside of the RiverWare model. In the RiverWare model, this pattern of loss is input at each affected reach. Figure 7 shows the sum of the annual groundwater loss patterns for the entire Snake River.

3,500 3,000 2,500 2,000 1,500 Loss (cfs) Loss 1,000 500 0 O N D J F M A M J J A S Month

Figure 7. The total annual groundwater pumping pattern removed as reach losses throughout the Upper Snake

3 It is assumed that groundwater influences have not changed substantially in the last 10 years. 4 Diversion ranges from 6.3 to 8.5 million acre-feet per year (IDWR 2013).

16 Modified Flows 2020 – Upper Snake River Basin

This representation of groundwater response is considered to be more accurate that the representation used in the 2010 level Modified Flows, largely because it was identified that return flows were too large and did not remove the consumptive use portion of diversion in 2010 study.

3.4. Upper Snake River Operation

Baseline operating rules for the Upper Snake River reflect the operating criteria in the Upper Snake Documentation (Reclamation 2020). Generally, for each timestep, reservoir operations occur in order from upstream to downstream, with each reservoir following specific logic for flood risk management, irrigation, and minimum flow constraints.

3.5. 2020 Modified Flows in the Upper Snake

The 2020 Modified Flows in the Upper Snake Basin have been calculated using a daily timestep. Figure 8 shows the time series of the daily regulated flows into Brownlee Dam (blue dashed). Monthly average flows were calculated from the daily time series and are also shown on the figure (orange solid line). The plots show how much the variability was smoothed by the averaging process.

Figure 8. 2020 Modified Flows data set for BRN for water years 1928 to 2018

Modified Flows 2020 – Upper Snak e River Basin 17

4. Discussion

The Modified Flows calculated in the 2020 level of development update are slightly different than the 2010 Modified Flows (Reclamation 2010; BPA 2011) data set. This is because different models were used (MODSIM for 2010 and RiverWare for 2020), and because the 2020 model was run at a daily timestep instead of monthly. The difference is also due to an updated representation of the groundwater response functions, considered to be more accurate than the 2010 representation, and to a change in the current level demand for the basin.

Figure 9 shows the total annual demand for the Snake River broken down by the Snake, Boise, and Payette subbasins. The decrease in the early 2000s was due to drought conditions, where irrigators took measures such as fallowing land to decrease overall demand. This decrease in demand during the early 2000s caused the 2010 level demands to appear lower, though it was just a reflection of the effect of this drought. From 1994 to 2017, total annual demand for irrigation averaged around 10 million acre-feet annually and the 2020 level demand averages around 9.8 million acre-feet annually.

Figure 9. Total annual demand for the Snake, Boise, and Payette subbasins from 1994 to 2017 The differences in annual volume and peaks for 1999 through 2008 (the last ten years of overlap in the two datasets) are presented in Table 4. The annual volumes for the 2020 dataset are six percent larger than the 2010 dataset on average. The maximum monthly volumes for 2020 are five percent larger than the 2010 dataset average and the minimum monthly volumes are four percent larger. Table 5 shows the comparison of the 2020 dataset to historical data for 2009 through 2018. The annual volumes for the modeled dataset are one percent larger than the actual flows. The maximum monthly volumes modeled inflows are one percent smaller than the actual flows and the minimum monthly volumes actual inflows are six percent smaller.

18 Modified Flows 2020 – Upper Snake River Basin

Table 4. Comparison of the 2020 Modified Flows dataset to the 2010 Modified Flows dataset for years 1999 to 2008 (the last 10 years of overlap). All volumes are in acre-feet.

Maximum Monthly Annual Volume Minimum Monthly Volume Year Volume 2020 2010 2020 2010 2020 2010 1999 18,339,912 17,435,221 2,690,229 2,660,513 705,432 732,325

2000 13,235,761 11,343,452 1,693,930 1,688,071 530,980 489,337 2001 8,273,367 7,804,078 948,537 895,114 461,969 404,432

2002 9,135,381 8,698,403 1,121,275 1,094,267 472,315 559,525 2003 9,072,097 8,431,877 1,354,596 1,108,033 459,778 445,754

2004 8,901,386 8,525,493 1,131,129 1,029,135 461,814 514,172

2005 8,478,417 7,873,598 1,415,450 1,260,811 450,731 494,707

2006 15,733,917 15,132,197 3,301,333 3,240,117 550,842 429,399

2007 8,934,296 8,176,819 1,111,277 1,166,607 469,897 397,311 2008 10,093,191 10,005,026 1,681,823 1,521,431 598,977 496,930

Averages 11,019,772 10,342,616 1,644,958 1,566,410 516,273 496,389 % Difference 6% -- 5% -- 4% -- vs. 2010

Table 5. Comparison of the 2020 Modified Flows dataset to measured inflows into Brownlee Dam (BRN) for years 2009 to 2018. All volumes are in acre-feet.

Maximum Monthly Annual Volume Minimum Monthly Volume Year Volume 2020 Actual 2020 Actual 2020 Actual 2009 10,607,848 11,149,745 1,549,897 1,641,025 610,667 628,582 2010 10,936,232 10,684,106 1,688,105 1,796,588 535,888 563,564 2011 17,824,772 18,396,635 2,971,192 3,451,537 669,826 704,807 2012 13,520,839 13,418,543 2,123,829 2,067,332 508,229 569,950 2013 8,116,071 7,952,257 900,909 864,696 427,269 446,327 2014 8,964,535 8,908,324 1,174,452 1,057,388 527,973 544,205 2015 8,530,452 8,196,218 1,102,791 1,007,008 407,992 462,109 2016 9,892,536 9,731,603 1,295,308 1,301,752 441,897 472,860 2017 19,611,225 18,980,430 3,803,430 3,724,760 640,350 628,086

Modified Flows 2020 – Upper Snak e River Basin 19

Maximum Monthly Annual Volume Minimum Monthly Volume Year Volume 2020 Actual 2020 Actual 2020 Actual 2018 13,440,066 13,172,225 2,120,302 1,960,452 546,224 621,565 Averages 12,144,458 12,059,009 1,873,021 1,887,254 531,632 564,205 % Difference 1% -- -1% -- -6% -- vs. Actual

The comparison of the monthly 2020 Modified Flows data set to the 2010 Modified Flows data set and actual inflows into Brownlee (BRN) is shown in Figure 10. The 2010 data set extends through 2008. The comparison of the daily 2020 Modified Flows data set to the actual inflows is shown for the most recent 10-year period, water years 2009 through 2018, in Figure 11. The 2020 Modified Flows data accurately represent the 2009 through 2018 water years with r-squared values of 0.92 for the daily data.

4,000,000

3,500,000

3,000,000

2,500,000

2,000,000 feet per month - 1,500,000 Acre

1,000,000

500,000

0 Oct-99 Oct-04 Oct-09 Oct-14

2010 Modified F lows Dataset 2020 Modified F lows

Figure 10. 2020 Modified Flows monthly data set compared with the 2010 Modified Flows data set for water years 1999 to 2018

20 Modified Flows 2020 – Upper Snake River Basin

80,000

70,000

60,000

50,000

40,000

Daily Flow (cfs) Flow Daily 30,000

20,000

10,000

0 Oct-09 Oct-10 Oct-11 Oct-12 Oct-13 Oct-14 Oct-15 Oct-16 Oct-17

Actual BRN Inflows Modeled BRN flows

Figure 11. 2020 Modified Flows daily data set compared with the actual flows at BRN for water years 2009 to 2018

Modified Flows 2020 – Upper Snak e River Basin 21

5. Summary

The 2020 level Modified Flows for the Upper Snake River basin represent operations, demands, and groundwater responses reflective of 2008 through 2019 conditions. These current level conditions were applied to unregulated streamflow from 1929 through 2018 at a daily timestep using a RiverWare model of the basin. Annual volumes reported at the inflow to Brownlee Reservoir are within one percent of measured volumes between 2008 and 2018.

The 2020 level Modified Flows differ from the 2010 level Modified Flows for the Upper Snake River basin largely due to changing models from a monthly MODSIM model to a daily RiverWare model, updating the representation of groundwater responses, and addressing changes to demand. The difference is within six percent of the total annual volume when comparing the years 1998 through 2008.

22 Modified Flows 2020 – Upper Snake River Basin

6. Literature Cited

Parenthetical Reference Bibliographic Citation BPA 2011 Bonneville Power Administration (BPA). 2011. 2010 Level Modified Streamflow. Cooperating agencies: U.S. Army Corps of Engineers and Bureau of Reclamation. DOE/BIP-4352. August 2011.

IDWR 2013 Idaho Department of Water Resources (IDWR). 2013. Enhanced Snake Plain Aquifer Model Version 2.1 Final Report. January 2013.

Reclamation 2010 Bureau of Reclamation. 2010. Modified and Naturalized Flows of the Snake River Basin above Brownlee Reservoir. May 2010.

Reclamation 2017 Bureau of Reclamation. 2017. Unregulated Flows in the Upper Deschutes Basin, Oregon. October 2017.

Reclamation 2020 Bureau of Reclamation. 2020. Upper Snake RiverWare Model: Model Documentation. May 2020 Draft.

Modified Flows 2020 – Upper Snak e River Basin 23

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24 Modified Flows 2020 – Upper Snake River Basin

Appendix A: Gains and Losses Calculations

A MODSIM model of the Upper Snake Basin was used to develop gains and losses for input into the RiverWare model. The detailed equations and data sources are provided below. For each calculation, there is a gainXXX and negXXX output value. This is because MODSIM cannot handle negative values, so wherever there is a loss, it is placed in the negXXX node.

Details of inflow to Henrys Lake (gainHENI/negHENI) calculation. Node Name Data Description Data Source HENI Henrys Lake Outflow Hydromet gage. Missing daily data filled in with disaggregated monthly data. HEN Henrys Lake historical reservoir contents Hydromet gage. General Equation gainHENI/negHENI = (HEN.storage[t] – HEN.storage[t-1]) + HENI

Details of local inflow between Henrys Lake and Island Park (gainISLI/negISLI) calculation. Node Name Data Description Data Source HENI Gage at HENI Hydromet gage. Lagged 1 day. ISLI Island Park Outflow Hydromet gage. Missing daily data filled in with disaggregated monthly data. ISL Island Park historical reservoir contents Hydromet gage. Evap Evaporation from Island Park WRCC Island Park General Equation gainISLI/negISLI = (ISL.storage[t]-ISL.storage[t-1]) + ISLI – HENI[t-1] + Evap

Details of local inflow between Island Park and gage at Henrys Fork near Ashton, ID (gainHFAI/negHFAI) calculation. Node Name Data Description Data Source ISLI Gage at ISLI Hydromet gage. Lagged 1 day. HFAI Gage at Henrys Fork near Ashton, ID Hydromet gage PmpISLToHFAI Historical diversions IDWR General Equation gainHFAI/negHFAI= HFAI – ISLI[t-1] + PmpISLToHFAI

Details of inflow to Grassy Lake (gainGRSY/negGRSY) calculation. Node Name Data Description Data Source GRSY Grassy Lake Outflow Hydromet gage. Missing daily data filled in with disaggregated monthly data. GRS Grassy Lake historical reservoir contents Hydromet gage. General Equation gainGRSY/negGRSY = (GRS.storage[t] – GRS.storage[t-1]) + GRSY

Modified Flows 2020 – Up per Snak e River Basin A-1

Details of local inflow between Grassy Lake and gage at Falls River near Squirrel, ID (gainFALI/negFALI) calculation. Node Name Data Description Data Source GRSY Gage at GRSY Hydromet gage. FALI Gage at Falls River near Squirrel, ID Hydromet gage General Equation gainFALI/negFALI= FALI – GRSY

Details of local inflow between gage FALI and gage at Falls River near Chester, ID (gainCHEI/negCHEI) calculation. Node Name Data Description Data Source FALI Gage at FALI Hydromet gage CHEI Gage at Falls River near Chester, ID Hydromet gage Yellow_M Historical diversions IDWR Sqrl_Che Historical diversions IDWR Farm_Own Historical diversions IDWR Enterpri Historical diversions IDWR PmpFALIToCHEISou Historical diversions IDWR Pmp FALITo CHE INor Historical diversions IDWR Fall_Riv Historical diversions IDWR Chest_CU Historical diversions IDWR Chester Historical diversions IDWR PumpCHEI GW pumping from Zones 20 Calculated by the model using response functions that were developed using MODFLOW model of the Upper Snake Basin rfCHEI Return flows from Yellow_M, Sqrl_Che, Calculated by the model using Farm_Own, PmpFALIToCHEISou, response functions that were PmpFALIToCHEINor, Chest_CU, developed using MODFLOW PmpISLToHFAI diversions model of the Upper Snake Basin General Equation gainCHEI/negCHEI=CHEI – FALI – rfCHEI + Yellow_M + Sqrl_Che + Farm_Own + Enterpri + PmpFALIToCHEISou + PmpFALIToCHEINOR + Fall_Riv + Chest_CU + Chester + PumpCHEI

Details of local inflow above gage at Henrys Fork near Anthony, ID (gainANTI/negANTI) calculation. Node Name Data Description Data Source CHEI Gage at CHEI Hydromet gage HFAI Gage at HFAI ANTI Gage at Henrys Fork near Anthony, ID Hydromet gage. Missing daily data filled in using statistical methods. CXCI Historical diversions IDWR Dewey Historical diversions IDWR Last_Cha Historical diversions IDWR

A-2 Modified Flows 2020 – Upper Snake River Basin

Node Name Data Description Data Source PmpHFAIToANTI Historical diversions IDWR FarmFr_S Historical diversions IDWR StAnth_U Historical diversions IDWR PumpANTI GW pumping from Zones 15, 16, 17, 20 Calculated by the model using response functions that were developed using MODFLOW model of the Upper Snake Basin rfANTI Return flows from Yellow_M, Sqrl_Che, Calculated by the model using Farm_Own, PmpFALIToCHEISou, response functions that were PmpFALIToCHEINor, Chest_CU, Chester, developed using MODFLOW Fall_Riv, Enterpri, PmpISLToHFAI, StAnth_U, model of the Upper Snake Basin FarmFr_S, Dewey, Last_Cha, PmpHFAIToANTI diversions General Equation gainANTI/negANTI=ANTI – CHEI – HFAI – rfANTI + CXCI + Dewey + Last_Cha + PmpHFAIToANTI + FarmFr_S + StAnth_U + PumpANTI

Details of local inflow above gage at Teton River above S Leigh Creek (gainDGGI/negDGGI) calculation. Node Name Data Description Data Source DGGI Gage at Teton River above S Leigh Creek Hydromet gage. Missing daily data filled in with disaggregated monthly data. General Equation gainDGGI/negDGGI = DGGI

Details of local inflow between gage DGGI and gage at Teton River near St. Anthony, ID (gainTEAI/negTEAI) calculation. Node Name Data Description Data Source DGGI Gage at DGGI Hydromet gage TEAI Gage at Teton River near St. Anthony, ID Hydromet gage. Missing daily data filled in with disaggregated monthly data. TET Teton Reservoir historical contents USGS gage 13054800 CRCI Crosscut Canal at End Hydromet gage. Missing daily data filled in with disaggregated monthly data. CanyonCrk Historical diversions IDWR PmpDGGIToTEAI Historical diversions IDWR General Equation gainTEAI/negTEAI=(TET.storage[t] – TET.storage[t-1]) + TEAI – DGGI – CRCI + CanyonCrk + PmpDGGIToTEAI

Modified Flows 2020 – Up per Snak e River Basin A-3

Details of local inflow above Teton River at Mouth (gainTRXI/negTRXI) calculation. Node Name Data Description Data Source TEAI Gage at TEAI Hydromet TRXI Teton River at Mouth flow estimate USGS gage 13055198 + USGS gage 13055340. Missing data filled in through a statistical relationship to Hydromet gage TEAI through the following equations: 13055198 ~= 0.3929*TEAI-20 13055340 ~= 0.4809*TEAI- 137.81 RexburgC Historical diversions IDWR Teton_Is Historical diversions IDWR Wilford Historical diversions IDWR PmpTEAIToHenrys Historical diversions IDWR Siddoway Historical diversions IDWR General Equation gainTRXI/negTRXI= TRXI– TEAI + RexburgC + TetonIs + Wilford + PmpTEAIToHenrys + Siddoway

Details of local inflow above gage at Henrys Fork near Rexburg, ID (gainREXI/negREXI) calculation. Node Name Data Description Data Source TRXI Gage at TRXI USGS gage 13055198 + USGS gage 13055340 ANTI Gage at ANTI Hydromet gage. Lagged 1 day. REXI Gage at Henrys Fork near Rexburg, ID Hydromet gage Consol_F Historical diversions IDWR Egin_Ind Historical diversions IDWR PumpREXI GW pumping from Zones 11, 14, 15, 16, 17, 18, Calculated by the model using 19, 20 response functions that were developed using MODFLOW model of the Upper Snake Basin rfREXI Return flows from Yellow_M, Sqrl_Che, Calculated by the model using Farm_Own, PmpFALIToCHEISou, response functions that were PmpFALIToCHEINor, Chest_CU, Chester, developed using MODFLOW Fall_Riv, Enterpri, PmpISLToHFAI, StAnth_U, model of the Upper Snake Basin FarmFr_S, Dewey, Last_Cha, PmpHFAIToANTI, PmpDGGIToTEAI, CanyonCrk, Wilford, PmpTEAIToHenrys, Teton_Is, Siddoway, Consol_F, Egin_Ind diversions General Equation gainREXI/negREXI= REXI – TRXI – ANTI[t-1] + Consol_F + Egin_Ind + PumpREXI – rfREXI

A-4 Modified Flows 2020 – Upper Snake River Basin

Details of inflow to Jackson Lake (gainJCKY/negJCKY) calculation. Node Name Data Description Data Source JCKY Jackson Lake Outflow Hydromet gage JCK Jackson Lake historical reservoir contents Hydromet gage General Equation gainJCKY/negJCKY = (JCK.storage[t] – JCK.storage[t-1]) + JCKY

Details of local inflow between Jackson Lake and gage at Snake River below Flat Creek near Jackson,WY (gainJKSY/negJKSY) calculation. Node Name Data Description Data Source JCKY Gage at JCKY Hydromet gage JKSY Gage at Snake River below Flat Creek near Hydromet gage. Missing data Jackson, WY filled in through a statistical relationship to Hydromet gage JCKY through the following equation: ~= 1.8932 *JCKY+903.61

General Equation gainJKSY/negJKSY= JKSY – JCKY

Details of local inflow between gage JKSY and Palisades (gainPALI/negPALI) calculation. Node Name Data Description Data Source JKSY Gage at JKSY Hydromet gage. Lagged 1 day. PALI Palisades Outflow Hydromet gage. Missing daily data filled in with disaggregated monthly data. PAL Palisades historical reservoir contents Hydromet gage Evap Evaporation from Palisades WRCC Palisades General Equation gainPALI/negPALI = (PAL.storage[t]-PAL.storage[t-1]) + PALI – JKSY[t-1] + Evap

Details of local inflow between Palisades and gage at Snake River near Heise, ID (gainHEII/negHEII) calculation. Node Name Data Description Data Source PALI Gage at PALI Hydromet gage HEII Gage at Snake River near Heise, ID Hydromet gage PmpPALToHEII Historical diversions IDWR PalCanal Historical diversions IDWR Riley Historical diversions IDWR, ended in 2008 General Equation gainHEII/negHEII= HEII – PALI + PmpPALToHEII + PalCanal + Riley

Modified Flows 2020 – Up per Snak e River Basin A-5

Details of inflow to Ririe (gainRIRI/negRIRI) calculation. Node Name Data Description Data Source RIRI Ririe Outflow Hydromet gage. Missing daily data filled in with disaggregated monthly data. RIR Ririe historical reservoir contents Hydromet gage Evap Evaporation from Ririe WRCC Rexburg Ricks College General Equation gainRIRI/negRIRI = (RIR.storage[t] – RIR.storage[t-1]) + RIRI + Evap

Details of local inflow between Ririe and gage at Willow Creek at Mouth near Idaho Falls, ID (gainWFWI/negWFWI) calculation. Node Name Data Description Data Source RIRI Gage at RIRI WFWI Gage at Willow Creek at Mouth near Idaho Hydromet gage. Missing daily Falls, ID data filled in with disaggregated monthly data. BlwRRdiv Historical diversions IDWR SandCDiv Historical diversions IDWR BlwSandC Historical diversions IDWR PmpRIRToSnake Historical diversions IDWR General Equation gainWFWI/negWFWI= WFWI – RIRI + BlwRRdiv + SandCDiv + BlwSandC + PmpRIRToSnake

Details of local inflow above gage at Snake River near Shelley, ID (gainSHYI/negSHYI) calculation. Node Name Data Description Data Source HEII Gage at HEII Hydromet gage REXI Gage at REXI Hydromet gage. Lagged 1 day. WFWI Gage at WFWI Hydromet gage SHYI Gage at Snake River near Shelley, ID Hydromet gage. Missing daily data filled in with disaggregated monthly data. PmpHEIIToLORI Historical diversions IDWR FarmF_En Historical diversions IDWR Harrison Historical diversions IDWR Burgess Historical diversions IDWR Anderson Historical diversions IDWR Eagle_Rk Historical diversions IDWR LowerDry09 Historical diversions IDWR LowerDry55 Historical diversions IDWR PmpDryBed Historical diversions IDWR Sunnydel Historical diversions IDWR ButteMrk Historical diversions IDWR BearTrap Historical diversions IDWR

A-6 Modified Flows 2020 – Upper Snake River Basin

Node Name Data Description Data Source PmpLORIToSIFI Historical diversions IDWR Osgood Historical diversions IDWR PmpSIFIToSHYI Historical diversions IDWR GreatWes Historical diversions IDWR Idaho Historical diversions IDWR SnkRivVa Historical diversions IDWR Woodvill Historical diversions IDWR PumpLORI GW pumping from Zones 11, 14, 15, 16, 17, 18, Calculated by the model using 19, 20 response functions that were developed using MODFLOW model of the Upper Snake Basin PumpSHYI GW pumping from Zones 2, 3, 4, 5, 6, 7, 8, 9, Calculated by the model using 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 response functions that were developed using MODFLOW model of the Upper Snake Basin rfLORI Return flows from FarmF_En, Harrison, Calculated by the model using Sunnydel, PmpDryBed, PmpHEIIToLORI, response functions that were LowerDry55, BearTrap diversions developed using MODFLOW model of the Upper Snake Basin rfSHYI Return flows from LowerDry09, Burgess, Calculated by the model using PmpLORIToSIFI, ButteMrk, CanyonCr, response functions that were PmpDGGIToTEAI, Dewey, Last_Cha, StAnthU, developed using MODFLOW Egin_ind, PmpHFAIToANTI, FarmF_En, model of the Upper Snake Basin Harrison, BlwRRdiv, Idaho, GreatWes, Osgood, PmpISLToHFAI, Yellow_M, PmpFALIToCHEISou, PmpFALIToCHEINor, Sqrl_Che, Farm_Own, Anderson, Sunnydel, RexburgC, Chest_CU, PmpHEIIToLORI, PmpDryBed, LowerDry55, BearTrap, Enterpri, Fall_Riv, Chester, FarmFr_S, Consol_F, Wilford, PmpTEAIToHenrys, Siddoway, Teton_Is diversions General Equation gainSHYI/negSHYI= SHYI – HEII – REXI[t-1] – WFWI + PmpHEIIToLORI + FarmF_En + Harrison + Burgess + Anderson + Eagle_Rk + LowerDry09 + LowerDry55 + PmpDryBed + Sunnydel + ButteMrk + BearTrap + PmpLORITOSIFI + Osgood + PmpSIFIToSHYI + GreatWes + Idaho + SnkRivVa + Woodvill + PumpLORI + PumpSHYI – rfLORI – rfSHYI

Modified Flows 2020 – Up per Snak e River Basin A-7

Details of local inflow above gage at Blackfoot River near Shelley, ID (gainBSHI/negBSHI) calculation. Node Name Data Description Data Source BSHI Blackfoot River near Shelley, ID USGS gage 13066000. Missing daily data filled in with disaggregated monthly data. General Equation gainBSHI/negBSHI = BSHI

Details of local inflow above gage at Blackfoot River near Blackfoot, ID (gainBLFI/negBLFI) calculation. Node Name Data Description Data Source BSHI Gage at BSHI USGS gage 13066000. RSDI Reservation Drop Hydromet gage. Missing daily data filled in with disaggregated monthly data. BLFI Gage at Blackfoot River near Blackfoot, ID USGS gage 13068500. Missing daily data filled in with disaggregated monthly data. General Equation gainBLFI/negBLFI= BLFI – BSHI – RSDI

Details of local inflow above gage at Snake River near Blackfoot, ID (gainBFTI/negBFTI) calculation. Node Name Data Description Data Source BLFI Gage at BLFI USGS gage 13068500 SHYI Gage at SHYI Hydromet gage. Lagged 1 day. BFTI Gage at Snake River near Blackfoot, ID Hydromet gage RECI Reservation Canal Hydromet gage NewLavas Historical diversions IDWR BlkftCor Historical diversions IDWR Blackfoot Historical diversions IDWR PmpSHYIToBFTI Historical diversions IDWR PeopAber Historical diversions IDWR Parsons Historical diversions IDWR PumpSNAI GW pumping from Zones 1, 2, 3, 4, 5, 6, 7, 8, 9, Calculated by the model using 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 response functions that were developed using MODFLOW model of the Upper Snake Basin rfSNAI Return flows from LowerDry09, Burgess, Calculated by the model using PmpLORIToSIFI, ButteMrk, CanyonCr, response functions that were PmpDGGIToTEAI, BlkftCor, Last_Cha, StAnthU, developed using MODFLOW Egin_Ind, PmpHFAIToANTI, FarmF_En, model of the Upper Snake Basin Harrison, BlwRRdiv, Idaho, SnkRivVa, GreatWes, Osgood, PmpSIFIToSHYI, Woodvill, Blackfoot, PmpSHYIToBFTI, NewLavas, Anderson, PmpPALToHEII, PalCanal, PmpRIRToSNAI, BlwSandC, SandCDiv,

A-8 Modified Flows 2020 – Upper Snake River Basin

Node Name Data Description Data Source Sunnydel, RexburgC, PmpHEIIToLORI, PmpDryBed, LowerDry55, BearTrap, Enterpri, Fall_Riv, Chester, FarmFr_S, Consol_F, Wilford, PmpTEAIToHenrys, Siddoway, Teton_Is, Riley diversions General Equation gainBFTI/negBFTI= BFTI – BLFI – SHYI[t-1] + NewLavas + BlkftCor + Blackfoot + PmpSHYToBFTI + PeopAber + Parsons + PumpSNAI – rfSNAI

Details of local inflow between gage BFTI and American Falls (gainAMFI/negAMFI) calculation. Node Name Data Description Data Source BFTI Gage at BFTI Hydromet gage. Lagged 1 day. AMFI American Falls Outflow Hydromet gage AMF American Falls historical reservoir contents Hydromet gage Portneuf Portneuf River USGS gage 13075500 Michaud Historical diversions IDWR FallsID Historical diversions IDWR PumpAMF GW pumping from Zones 1, 2, 3, 4, 5, 6, 7, 8, 9, Calculated by the model using 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 response functions that were developed using MODFLOW model of the Upper Snake Basin rfAMF Return flows from PeopAber, LowerDry09, Calculated by the model using Burgess, PmpLORIToSIFI, ButteMrk, CanyonCr, response functions that were PmpDGGIToTEAI, BlkftCor, Dewwy, developed using MODFLOW PmpHFAIToANTI, Last_Cha, StAnthU, Egin_Ind, model of the Upper Snake Basin Michaud, FallsID, FarmF_En, Harrison, BlwRRdiv, Idaho, SnkRivVa, GreatWes, Osgood, PmpSIFIToSHYI, Woodvill, Blackfoot, PmpSHYIToBFTI, NewLavas, Anderson, PmpPALToHEII, PalCanal, PmpRIRToSNAI, BlwSandC, SandCDiv, Sunnydel, RexburgC, Chest_CU, PmpHEIIToLORI, PmpDryBed, LowerDry55, BearTrap, Enterpri, Fall_Riv, Chester, FarmFr_S, Consol_F, Wilford, PmpTEAIToHenrys, Siddoway, Teton_Is, Riley, Parsons diversions Evap Evaporation from American Falls WRCC Aberdeen Experimnt Stn General Equation gainAMFI/negAMFI = (AMF.storage[t]-AMF.storage[t-1]) + AMFI – Portneuf – BFTI[t-1] + Michaud + FallsID + PumpAMF – rfAMF + Evap

Modified Flows 2020 – Up per Snak e River Basin A-9

Details of local inflow between American Falls and Minidoka (gainMINI/negMINI) calculation. Node Name Data Description Data Source AMFI Gage at AMFI Hydromet gage MINI Minidoka Outflow Hydromet gage MIN Minidoka historical reservoir contents Hydromet gage MINsouth Historical diversions IDWR MINnorth Historical diversions IDWR PmpAMFTToMIN Historical diversions IDWR PumpMINI GW pumping from Zones 3, 4, 5, 6, 7, 8, 9 Calculated by the model using response functions that were developed using MODFLOW model of the Upper Snake Basin rfMINI Return flows from FallsID, PmpAMFTToMIN, Calculated by the model using MINnorth, Michaud, PeopAber diversions response functions that were developed using MODFLOW model of the Upper Snake Basin Evap Evaporation from Minidoka WRCC Minidoka Dam General Equation gainMINI/negMINI = (MIN.storage[t]-MIN.storage[t-1]) + MINI– AMFI + MINsouth + MINnorth + PmpAMFTToMIN + PumpMINI – rfMINI + Evap

Details of local inflow between Minidoka and gage at Snake River at Milner, ID (gainMILI/negMILI) calculation. Node Name Data Description Data Source MINI Gage at MINI Hydromet gage. Lagged 1 day. MILI Gage at Snake River near Milner, ID Hydromet gage A_BPump Historical diversions IDWR NorthSid Historical diversions IDWR PmpMINToMIL Historical diversions IDWR SSideTwi Historical diversions IDWR MilGood Historical diversions IDWR MilLowLi Historical diversions IDWR General Equation gainMILI/negMILI = MILI – MINI[t-1] + A_BPump + NorthSid + PmpMINToMIL + SSideTwi + MilGood + MilLowLi

Details of local inflow between gage MILI and gage at Snake River near Kimberly, ID (gainKIMI/negKIMI) calculation. Node Name Data Description Data Source MILI Gage at MILI Hydromet gage KIMI Snake River near Kimberly, ID USGS gage 13090000 General Equation gainKIMI/negKIMI = KIMI – MILI

A-10 Modified Flows 2020 – Upper Snake River Basin

Details of local inflow between gage KIMI and gage at Snake River near Buhl, ID (gainBuhl/negBuhl) calculation. Node Name Data Description Data Source KIMI Gage at KIMI USGS gage 13090000. Lagged 1 day. Buhl Snake River near Buhl, ID USGS gage 13094000. Missing daily data filled in with disaggregated monthly data. PumpBuhl GW pumping from Zones 1, 2, 3, 4, 5, 6, 7, 8, 9, Calculated by the model using 10 response functions that were developed using MODFLOW model of the Upper Snake Basin rfBuhl Return flows from A_BPump, PeopAber, Calculated by the model using MINsouth, MINnorth, PmpMINToMIL, response functions that were Micahud, FallsID, MilLowLi, PmpAMFTToMIN, developed using MODFLOW NorthSid, SSideTwi, MilGood, MilLowLi model of the Upper Snake Basin diversions General Equation gainBuhl/negBuhl = Buhl – KIMI[t-1] + PumpBuhl – rfBuhl

Details of local inflow between gage Buhl and gage at Snake River below Lower Salmon Falls near Hangerman, ID (gainSnkblwSalmon/negSnkblwSalmon) calculation. Node Name Data Description Data Source Buhl Gage at Buhl USGS gage 13094000 SnkblwSalmon Gage at Snake River below Lower Salmon Falls USGS gage 13135000. Missing near Hangerman, ID daily data filled in with disaggregated monthly data. PumpHAGI GW pumping from Zones 1, 2, 3, 4, 5, 6, 7, 8, 9, Calculated by the model using 10 response functions that were developed using MODFLOW model of the Upper Snake Basin rfHAGI Return flows from A_BPump, MINsouth, Calculated by the model using MINnorth, PmpMINToMIL, Micahud, FallsID, response functions that were MilLowLi, PmpAMFTToMIN, NorthSid, developed using MODFLOW SSideTwi, MilGood diversions model of the Upper Snake Basin General Equation gainSnkblwSalmon/negSnkblwSalmon = SnkblwSalmon – Buhl + PumpHAGI– rfHAGI

Modified Flows 2020 – Up per Snak e River Basin A-11

Details of local inflow between gage SnkBlwSalmon and gage at Snake River at King Hill, ID (gainSKHI/negSKHI) calculation. Node Name Data Description Data Source SnkBlwSalmon Gage at SnkBlwSalmon USGS gage 13135000 SKHI Gage at Snake River at King Hill, ID Hydromet gage WoodGood Malad River near Gooding, ID USGS gage 13152500. Missing daily data filled in with disaggregated monthly data. PumpSKHI GW pumping from Zones 1, 2, 3, 4, 5, 6, 7, 8, 9, Calculated by the model using 10 response functions that were developed using MODFLOW model of the Upper Snake Basin rfSKHI Return flows from A_BPump, MINsouth, Calculated by the model using MINnorth, PmpMINToMIL, MilLowLi, response functions that were PmpAMFTToMIN, NorthSid, SSideTwi, developed using MODFLOW MilGood diversions model of the Upper Snake Basin General Equation gainSKHI/negSKHI = SKHI – SnkBlwSalmon – WoodGood + PumpSKHI – rfSKHI

Details of local inflow between gage SKHI and gage at Snake River near Murphy, ID (gainSWAI/negSWAI) calculation. Node Name Data Description Data Source SKHI Gage at SKHI Hydromet gage. Lagged 1 day. SWAI Gage at Snake River near Murphy, ID Hydromet gage BruneauR Bruneau River near Hot Spring, ID USGS gage 13168500. Missing daily data filled in with disaggregated monthly data. General Equation gainSWAI/negSWAI = SWAI – SKHI[t-1] – BruneauR

Details of inflow to Anderson Ranch (gainANDI/negANDI) calculation. Node Name Data Description Data Source ANDI Anderson Ranch Outflow Hydromet gage AND Anderson Ranch historical reservoir contents Hydromet gage Evap Evaporation from Anderson Ranch WRCC Arrowrock Dam General Equation gainANDI/negANDI = (AND.storage[t] – AND.storage[t-1]) + ANDI + Evap

A-12 Modified Flows 2020 – Upper Snake River Basin

Details local inflow between Anderson Ranch and Arrowrock (gainARKI/negARKI) calculation. Node Name Data Description Data Source ANDI Gage at ANDI Hydromet gage ARKI Arrowrock Outflow Hydromet gage BoiTwSp Boise River nr Twin Springs, ID Hydromet gage BTSI ARK Arrowrock historical reservoir contents Hydromet gage Evap Evaporation from Arrowrock WRCC Arrowrock Dam General Equation gainARKI/negARKI = (ARK.storage[t] – ARK.storage[t-1]) + ARKI – ANDI – BoiTwSp + Evap

Details local inflow between Arrowrock and Lucky Peak (gainLUCI/negLUCI) calculation. Node Name Data Description Data Source ARKI Gage at ARKI Hydromet gage LUCI Lucky Peak Outflow Hydromet gage Missing daily data filled in statistical relation between LUCI and ARKI using unregulated and measured flows LUC Lucky Peak historical reservoir contents Hydromet gage Evap Evaporation from Lucky Peak WRCC Arrowrock Dam General Equation gainLUCI/negLUCI = (LUC.storage[t] – LUC.storage[t-1]) + LUCI – ARKI + Evap

Modified Flows 2020 – Up per Snak e River Basin A-13

Details of local inflow between Lucky Peak and gage at Boise River at Glenwood Bridge near Boise, ID (gainBIGI/negBIGI) calculation. Node Name Data Description Data Source LUCI Gage at LUCI Hydromet gage BIGI Gage at Boise River at Glenwood Bridge near Hydromet gage Boise, ID BubbBois Historical diversions IDWR Penitent Historical diversions IDWR NewYork Historical diversions IDWR Ridenbau Historical diversions IDWR Settlers Historical diversions IDWR FarmersU Historical diversions IDWR Thurman Historical diversions IDWR gwReturnBIGI Groundwater return flows from Penitent, Calculated by the model using BubbBois, Settlers, Thurman diversions response functions that were developed using MODFLOW model of the Upper Snake Basin swReturnBIGI Surface water return flows from Penitent, Calculated by the model using BubbBois, FarmersU diversions response functions that were developed using MODFLOW model of the Upper Snake Basin General Equation gainBIGI/negBIGI = BIGI – LUCI + BubbBois + Penitent + NewYork + Ridenbau + Settlers + FarmersU + Thurman – gwReturnBIGI – swReturnBIGI

Details of local inflow between gage BIGI and gage at Boise River near Middleton, ID (gainBOMI/negBOMI) calculation. Node Name Data Description Data Source BIGI Gage at BIGI Hydromet gage BOMI Gage at Boise River near Middleton, ID Hydromet gage NEagleIs Historical diversions IDWR Phyllis Historical diversions IDWR CanyonCn Historical diversions IDWR CaldwHig Historical diversions IDWR gwReturnBOMI Groundwater return flows from NewYork, Calculated by the model using Penitent, Ridenbau, BubbBois, Settlers, response functions that were Thurman, FarmersU diversions developed using MODFLOW model of the Upper Snake Basin swReturnBOMI Surface water return flows from Ridenbau, Calculated by the model using BubbBois, Settlers, Thurman, FarmersU response functions that were diversions developed using MODFLOW model of the Upper Snake Basin sw2BOMI Groundwater return flows from NEagleIs, Calculated by the model using Phyllis, CanyonCn, CaldwHig diversions response functions that were

A-14 Modified Flows 2020 – Upper Snake River Basin

Node Name Data Description Data Source developed using MODFLOW model of the Upper Snake Basin gw2BOMI Groundwater return flows from NEagleIs, Calculated by the model using Phyllis, CayonCn, CaldwHig diversions response functions that were developed using MODFLOW model of the Upper Snake Basin General Equation gainBOMI/negBOMI = BOMI – BIGI + NEagleIs + Phyllis + CanyonCn + CaldwHig – gwReturnBIGI – swReturnBIGI – sw2BOMI – gw2BOMI

Details of local inflow between gage BOMI and gage at Boise River near Parma, ID (gainPARI/negPARI) calculation. Node Name Data Description Data Source BOMI Gage at BOMI Hydromet gage PARI Gage at Boise River near Parma, ID Hydromet gage Sebree Historical diversions IDWR Riversid Historical diversions IDWR Eureka2 Historical diversions IDWR NotsParm Historical diversions IDWR gwReturnPARI Groundwater return flows from NewYork, Calculated by the model using Penitent, Ridenbau, BubbBois, Settlers, response functions that were FarmersU, CaldwHig, CayonCn, NEagleIs, developed using MODFLOW Phyllis diversions model of the Upper Snake Basin swReturnPARI Surface water return flows from NewYork, Calculated by the model using Ridenbau, Settlers, Thurman, FarmersU, response functions that were CaldwHig, CayonCn, NEagleIs, Phyllis developed using MODFLOW diversions model of the Upper Snake Basin sw2PARI Groundwater return flows from Sebree, Calculated by the model using Riversid, Eureka2, NotsParm diversions response functions that were developed using MODFLOW model of the Upper Snake Basin gw2PARi Groundwater return flows from Sebree, Calculated by the model using Riversid, Eureka2, NotsParm diversions response functions that were developed using MODFLOW model of the Upper Snake Basin General Equation gainPARI/negPARI = PARI – BOMI + Sebree + Riversid + Eureka2 + NotsParm – gwReturnPARI – swReturnPARI – sw2PARI – gw2PARI

Modified Flows 2020 – Up per Snak e River Basin A-15

Details of inflow to Deadwood Reservoir (gainDEDI/negDEDI) calculation. Node Name Data Description Data Source DEDI Deadwood Reservoir Outflow Hydromet gage DED Deadwood Reservoir historical reservoir Hydromet gage contents General Equation gainDEDI/negDEDI = (DED.storage[t] – DED.storage[t-1]) + DEDI

Details of local inflow for South Fork of the Payette River at Lowman, ID (gainPRLI/negPRLI) calculation. Node Name Data Description Data Source PRLI Gage at South Fork Payette River near Hydromet gage. Missing daily Lowman, ID data filled in with disaggregated monthly data. General Equation gainPRLI/negPRLI = PRLI

Details of inflow to Payette Lake (gainPAYI/negPAYI) calculation. Node Name Data Description Data Source PAYI Payette Lake Outflow Hydromet gage PAY Payette Lake historical reservoir contents Hydromet gage General Equation gainPAYI/negPAYI = (PAY.storage[t] – PAY.storage[t-1]) + PAYI

Details of inflow from Payette Lake to Cascade (gainCSCI/negCSCI) calculation. Node Name Data Description Data Source CSCI Cascade Outflow Hydromet gage. Missing daily data filled in with disaggregated monthly data. CSC Cascade historical reservoir contents Hydromet gage PAYI Gage at PAYI Hydromet gage. Lagged 1 day. Evap Evaporation from Cascade Hydromet gage General Equation gainCSCI/negCSCI = (CSC.storage[t] – CSC.storage[t-1]) + CSCI – PAYI[t-1] + Evap

Details of local inflow between Cascade and gage at North Fork Payette River near Banks, ID (gainPABI/negPABI) calculation. Node Name Data Description Data Source CSCI Gage at CSCI Hydromet gage. Lagged 1 day. PABI Gage at North Fork Payette River near Banks, Hydromet gage. Missing daily ID data filled in with disaggregated monthly data. General Equation gainPABI/negPABI = PABI – CSCI[t-1]

A-16 Modified Flows 2020 – Upper Snake River Basin

Details of local inflow above gage at Payette River near Horseshoe Bend, ID (gainHRSI/negHRSI) calculation. Node Name Data Description Data Source DEDI Gage at DEDI Hydromet gage. Lagged 1 day. PRLI Gage at PRLI Hydromet gage. Lagged 1 day. PABI Gage at PABI Hydromet gage HRSI Gage at Payette River near Horseshoe Bend, ID Hydromet gage General Equation gainHRSI/negHRSI = HRSI – DEDI[t-1] – PRLI[t-1] – PABI

Details of inflow from gage HRSI to Black Canyon (gainEMMI/negEMMI) calculation. Node Name Data Description Data Source HRSI Gage at HRSI Hydromet gage EMMI Black Canyon Outflow Hydromet gage EMM Black Canyon historical reservoir contents Hydromet gage NsBlkCan Historical diversions IDWR SsBlkCan Historical diversions IDWR Evap Evaporation from Black Canyon WRCC Emmett 2 E General Equation gainEMMI/negEMMI = (EMM.storage[t] – EMM.storage[t-1]) + EMMI – HRSI + NsBlkCan + SsBlkCan + Evap

Details of inflow from Black Canyon to gage at Payette River near Leatha, ID (gainPLEI/negPLEI) calculation. Node Name Data Description Data Source EMMI Gage at EMMI Hydromet gage PLEI Gage at Payette River near Leatha, ID Hydromet gage. Missing daily data filled in with disaggregated monthly data. 640 Historical diversions IDWR 640b Historical diversions IDWR 655 Historical diversions IDWR 7mile Historical diversions IDWR rfPLEI Groundwater return flows from NsBlkCan, Calculated by the model using SsBlkCan diversions response functions that were developed using MODFLOW model of the Upper Snake Basin General Equation gainPLEI/negPLEI = PLEI – EMMI + 640 + 640b + 655 + 7mile – rfPLEI

Details of inflow from gage PLEI to gage at Payette River near Payette, ID (gainPRPI/negPRPI) calculation. Node Name Data Description Data Source PLEI Gage at PLEI Hydromet gage PRPI Gage at Payette River near Payette, ID Hydromet gage. Missing daily data filled in with disaggregated monthly data.

Modified Flows 2020 – Up per Snak e River Basin A-17

Node Name Data Description Data Source 660_670 Historical diversions IDWR 7mile Canal return from 7mile diversion IDWR. Lagged 1 day. rfPFBI Groundwater return flows from NsBlkCan, Calculated by the model using SsBlkCan, 640, 640b, 655 diversions response functions that were developed using MODFLOW model of the Upper Snake Basin rfPNPI Groundwater return flows from NsBlkCan, Calculated by the model using SsBlkCan, 640, 640b, 655 diversions response functions that were developed using MODFLOW model of the Upper Snake Basin rfPRPI Groundwater return flows from NsBlkCan, Calculated by the model using SsBlkCan, 640, 640b, 655 diversions response functions that were developed using MODFLOW model of the Upper Snake Basin General Equation gainPRPI/negPRPI= PRPI – PLEI + 660_670 – 7mile[t-1] – rfPFBI – rfPNPI – rfPRPI

Details of local inflow above gage at Snake River near Weiser, ID (gainWEII/negWEII) calculation. Node Name Data Description Data Source SWAI Gage at SWAI Hydromet gage PARI Gage at PARI Hydromet gage PRPI Gage at PRPI Hydromet gage WEII Gage at Snake River near Weiser, ID Hydromet gage OWYI Lake Owyhee and Owyhee River near Nyssa, Hydromet gage. Missing daily OR data filled in with disaggregated monthly data. Malheur Malheur River below Nevada Dam near Vale, Hydromet gage VALO. Missing OR daily data filled in with disaggregated monthly data. WeiserR Weiser River near Weiser, ID USGS gage 13266000. Missing daily data filled in with disaggregated monthly data. rfblwPRPI Groudwater return flows from 660_670 Calculated by the model using diversions response functions that were developed using MODFLOW model of the Upper Snake Basin General Equation gainWEII/negWEII= WEII – SWAI – PARI – PRPI – OWYI – Malheur – Weiser– rfblwPRPI

A-18 Modified Flows 2020 – Upper Snake River Basin

Details of local inflow between gage WEII and Browlee Dam (gainBRN/negBRN) calculation. Node Name Data Description Data Source WEII Gage at WEII Hydromet gage BRN_IN Snake River at Brownlee Dam Outflow Hydromet gage BRN. Missing daily data filled in with disaggregated monthly data. General Equation gainWEII/negWEII= BRN_IN – WEII

Modified Flows 2020 – Up per Snak e River Basin A-19

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A-20 Modified Flows 2020 – Upper Snake River Basin

Appendix B: Unregulated Flows Calculations

Table B-1. Locations of unregulated flow calculations including the U.S. Geological Survey (USGS) gage numbers and equation to convert gain/loss into unregulated flows

USGS Gage Reclamation Site Name Flow Calculation Number Gage Name Henrys Lake Outflow HENI = / = + Henrys Fork nr Island ISLI 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑢𝑢𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔/𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / Park, ID Island Park 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Outflow Henrys Fork nr Ashton, HFAI = / + / +

ID 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Grassy Lake Outflow GRS = / = + Falls River nr Squirrel, ID FALI 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑢𝑢𝑛𝑛𝑟𝑟𝑒𝑒𝑒𝑒 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / = + + Falls River nr Chester, ID CHEI 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐺𝐺𝐺𝐺𝑆𝑆𝑌𝑌𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔𝑔𝑔𝑔𝑔𝑛𝑛 𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 Henrys Fork at St. ANTI = / + / + 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + Anthony, ID 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = Teton River abv S Leigh DGGI 𝐶𝐶𝐶𝐶𝐶𝐶𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Creek 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Teton River nr St. TEAI = / + / Anthony, ID 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑜𝑜𝑜𝑜𝑜𝑜 Teton River at Mouth 13055198 + = / + / + (TRXI) 13055340 / 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Henrys Fork nr Rexburg, REXI 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / / ID / + / + / + 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑢𝑢𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Jackson Lake Outflow JCKY = / 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑋𝑋𝑋𝑋𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + Snake River below Flat JKSY 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔/𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / Creek near Jackson, WY 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Snake River nr Irwin PALI = / + / + Palisades Outflow / 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑔𝑔 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Snake River nr Heise, ID HEII 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / / + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑢𝑢𝑢𝑢/ 𝑢𝑢𝑢𝑢𝑢𝑢 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = Willow Cr blw Ririe Dam RIRI 𝑃𝑃𝑃𝑃𝐿𝐿𝐿𝐿𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Ririe Dam Outflow 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑢𝑢𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Willow Cr at mouth nr WFWI = / + / Idaho Falls, ID 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Snake River nr Shelley, SHYI = / + / + + + + ID 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑅𝑅𝑋𝑋𝑋𝑋𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

Modified Flows 2020 – Up per Snak e River Basin B-1

USGS Gage Reclamation Site Name Flow Calculation Number Gage Name

/ + / + / +

𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑠𝑠 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = Blackfoot River nr 13066000 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / Shelley, ID (BSHI) 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑢𝑢𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Blackfoot River nr BLFI = / + / Blackfoot, ID 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Snake River nr Blackfoot, BFTI = / + / + ID / + / + / + 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑠𝑠 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝑋𝑋𝑋𝑋𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑜𝑜𝑙𝑙𝑙𝑙 + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = Portneuf River at 13075500 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 /𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Pocatello, ID (Portneuf) 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Snake River at Neeley AMFI = / + / + + + + American Falls Outflow 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑢𝑢𝑢𝑢/ 𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑖𝑖𝑛𝑛 /𝑙𝑙𝑜𝑜𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐾𝐾𝐾𝐾𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐼𝐼 𝑔𝑔𝑎𝑎𝑔𝑔𝑢𝑢 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Snake River nr Minidoka, MINI 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑜𝑜𝑜𝑜𝑜𝑜 𝐴𝐴𝐴𝐴/𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑠𝑠 / ID / + / + / + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑎𝑎𝑖𝑖𝑖𝑖/ 𝑙𝑙𝑜𝑜𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑛𝑛 /𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 𝑊𝑊𝑊𝑊𝑊𝑊𝐼𝐼𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / = + + Snake River at Milner, ID MILI 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴/𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀/ 𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + / + / + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑜𝑜𝑜𝑜𝑜𝑜 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑛𝑛/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑠𝑠𝑠𝑠 + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 /

𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑒𝑒𝑢𝑢𝑢𝑢/𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Snake River nr Kimberly, KIMI = / + / + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + ID 𝐾𝐾𝐼𝐼𝐼𝐼𝐼𝐼𝑢𝑢/ 𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝐸𝐸𝐴𝐴𝐼𝐼𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝐿𝐿𝐿𝐿𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

B-2 Modified Flows 2020 – Upper Snake River Basin

USGS Gage Reclamation Site Name Flow Calculation Number Gage Name

/ + / + / + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃/𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴/𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑜𝑜𝑜𝑜𝑜𝑜 = + + Snake River nr Buhl, ID 13094000 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝑔𝑔𝑔𝑔𝑔𝑔/𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / (Buhl) / + / + / + 𝐵𝐵𝐵𝐵ℎ𝑙𝑙𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐼𝐼𝐼𝐼𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐻𝐻𝐺𝐺𝐼𝐼 𝐼𝐼𝐼𝐼𝑔𝑔𝑢𝑢 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃/𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴/𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀/ 𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Snake River blw Lower 13135000 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑜𝑜𝑜𝑜𝑜𝑜 𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝑔𝑔𝑔𝑔𝑖𝑖𝑖𝑖 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵ℎ/ 𝑙𝑙𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / Salmon Falls nr / + / + / + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑢𝑢𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Hagerman, ID / + / + / + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝑅𝑅𝑆𝑆𝑌𝑌𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + (SnkblwLSalmon) 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐾𝐾𝐼𝐼𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑠𝑠 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝐻𝐻𝐻𝐻/ 𝑔𝑔 𝑔𝑔𝑖𝑖𝑛𝑛 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐾𝐾𝐾𝐾𝐾𝐾𝐾𝐾/𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵ℎ𝑙𝑙𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Malad River nr Gooding, 13152500 = / 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 ID (Woodgood) 𝑊𝑊𝑜𝑜𝑜𝑜𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Snake River at King Hill, SKHI = / + / + ID / + / + / + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑛𝑛 /𝑙𝑙𝑙𝑙𝑠𝑠𝑠𝑠 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑎𝑎𝑖𝑖𝑖𝑖 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑆𝑆𝑆𝑆𝑌𝑌𝑌𝑌𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝐻𝐻𝐻𝐻/ 𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐾𝐾𝐻𝐻𝐴𝐴𝐻𝐻/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵ℎ𝑙𝑙𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/

𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆/𝑆𝑆𝑙𝑙𝑚𝑚𝑚𝑚𝑚𝑚𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = Bruneau River nr Hot 13168500 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / Spring, ID (BruneauR) 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵 𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Snake River nr Murphy, SWAI = / + / + + + + ID 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐻𝐻𝐻𝐻𝑁𝑁𝐼𝐼𝑔𝑔𝑔𝑔 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑜𝑜𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝐸𝐸𝐸𝐸𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔𝑔𝑔𝑔𝑔𝑛𝑛/ 𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑠𝑠 / + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝑀𝑀𝐹𝐹/𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝐻𝐻𝐻𝐻/ 𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐾𝐾𝐻𝐻𝐴𝐴𝐻𝐻/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵ℎ𝑙𝑙𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆/𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊/𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑟𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

Modified Flows 2020 – Up per Snak e River Basin B-3

USGS Gage Reclamation Site Name Flow Calculation Number Gage Name SF Boise River at ANDI = / Anderson Ranch 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

Boise River nr Twin BTSI = / Springs, ID (TwSp) 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Boise River Arrowrock ARKI = / + / + Outflow / 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Boise River Lucky Peak LUCI 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / / + Outflow 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 = + + Boise River at Glenwood BIGI 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / Bridge nr Boise, ID / + / + / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑢𝑢 𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Boise River nr BOMI 𝐴𝐴𝐴𝐴𝐴𝐴𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐿𝐿𝐿𝐿𝐿𝐿𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐼𝐼𝐺𝐺𝐺𝐺𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + Middleton, ID 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑢𝑢𝑢𝑢/ 𝑢𝑢𝑢𝑢𝑢𝑢 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Boise River nr Parma, ID PARI 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑠𝑠𝑠𝑠 / / + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = Deadwood River DEDI 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑔𝑔 𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 Deadwood Reservoir 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Outflow South Fork Payette River PRLI = / at Lowman, ID 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 NF Payette River at PAYI = / McCall 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢𝑢𝑢𝑟𝑟𝑒𝑒𝑒𝑒 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 NF Payette River CSCI = / + / Cascade Dam Outflow 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 NF Payette River nr PABI = / + / +

Banks, ID 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢𝑢𝑢/ 𝑢𝑢𝑢𝑢𝑢𝑢 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐶𝐶𝐶𝐶𝐶𝐶𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Payette River nr HRSI 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑖𝑖𝑛𝑛 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / / Horseshoe Bend, ID / + / + / + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 = + + Payette River Black EMMI 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / / Canyon Reservoir / + / + / + 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Outflow / + / 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Payette River nr Leatha, PLEI 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝑔𝑔/𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / ID / + / + / + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙/ 𝑠𝑠𝑠𝑠 Payette River nr Payette, PRPI = / + / + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑠𝑠𝑠𝑠 + + + ID 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑠𝑠 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙

𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑖𝑖𝑛𝑛 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = Weiser River nr Weiser, 13266000 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / ID (Weirserr) 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑛𝑛 𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 Malheur River blw VALO = / Nevada Dam nr Vale, OR 𝑀𝑀𝑀𝑀𝑀𝑀ℎ𝑒𝑒𝑒𝑒𝑒𝑒𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑀𝑀𝑀𝑀𝑀𝑀ℎ𝑒𝑒𝑒𝑒𝑒𝑒𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑠𝑠𝑠𝑠 (Malheur)

B-4 Modified Flows 2020 – Upper Snake River Basin

USGS Gage Reclamation Site Name Flow Calculation Number Gage Name Lake Owyhee and OWYI = / Owyhee River near 𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 Nyssa, OR Snake River nr Weiser, WEII = / + / + + + + ID 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢/ 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑠𝑠 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝐿𝐿𝐿𝐿𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑎𝑎𝑖𝑖𝑛𝑛/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝐻𝐻𝐻𝐻/ 𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐾𝐾𝐻𝐻𝐴𝐴𝐻𝐻/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵ℎ𝑙𝑙𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆/𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊/𝑊𝑊𝑜𝑜𝑑𝑑𝑔𝑔𝑜𝑜𝑜𝑜𝑑𝑑𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔 𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝑟𝑟𝑟𝑟𝑒𝑒𝑆𝑆𝐺𝐺𝑔𝑔 /𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑆𝑆𝑊𝑊𝐻𝐻𝐻𝐻𝑔𝑔 /𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑓𝑓𝐼𝐼𝑝𝑝𝑔𝑔𝑔𝑔𝑔𝑔/𝑔𝑔 𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 𝐴𝐴𝐺𝐺𝐽𝐽𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑠𝑠𝑠𝑠 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔 𝑔𝑔𝑔𝑔𝑛𝑛 𝑙𝑙𝑙𝑙/𝑠𝑠𝑠𝑠 𝑃𝑃𝑃𝑃𝐵𝐵𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑃𝑃𝑃𝑃𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝑀𝑀ℎ𝑒𝑒𝑒𝑒𝑒𝑒𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 = + + Snake River at Brownlee BRN 𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝐼𝐼𝑔𝑔/𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / Dam / + / + / + 𝐵𝐵𝐵𝐵𝐵𝐵𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢𝑢 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝐼𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + Outflow 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝐹𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐶𝐶 𝐶𝐶𝐶𝐶𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐻𝐻𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑜𝑜𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 / 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝐺𝐺𝑇𝑇𝑇𝑇𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝐸𝐸𝑇𝑇𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝐽𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐽𝐽𝐽𝐽𝐽𝐽𝐺𝐺𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑖𝑖𝑖𝑖 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑅𝑅𝑅𝑅𝐺𝐺𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔 𝑔𝑔𝑔𝑔𝑛𝑛/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝐻𝐻𝐻𝐻/ 𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + 𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑀𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐾𝐾𝐻𝐻𝐴𝐴𝐻𝐻/𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵ℎ𝑙𝑙𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝑆𝑆𝑆𝑆𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘𝑘/ 𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊/𝑊𝑊𝑜𝑜𝑑𝑑𝑔𝑔𝑜𝑜𝑜𝑜𝑑𝑑𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ + + + 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑔𝑔 𝑔𝑔 𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝑟𝑟𝑟𝑟𝑒𝑒𝑆𝑆𝐺𝐺𝑔𝑔 /𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑆𝑆𝑊𝑊𝐻𝐻𝐻𝐻𝑔𝑔 /𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑠𝑠𝑠𝑠 + + + 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑇𝑇𝑓𝑓𝐼𝐼𝑝𝑝𝑔𝑔 𝑔𝑔𝑔𝑔/𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐴𝐴𝐺𝐺𝐽𝐽𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝐿𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑜𝑜𝑠𝑠𝑠𝑠 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑃𝑃𝑃𝑃𝑃𝑃𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑙𝑙𝑙𝑙𝑙𝑙𝑠𝑠 + + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 /𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝐶𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑃𝑃𝑃𝑃𝐵𝐵𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙/𝑙𝑙𝑙𝑙𝑙𝑙 + + + 𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔/𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑃𝑃𝑃𝑃𝐸𝐸𝐻𝐻𝑔𝑔 𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 / + + 𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑃𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙/ 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔/ 𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑀𝑀𝑀𝑀𝑀𝑀ℎ𝑒𝑒/𝑒𝑒𝑟𝑟𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑂𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑊𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙 𝐵𝐵𝐵𝐵𝐵𝐵𝑔𝑔𝑔𝑔𝑔𝑔𝑔𝑔 𝑙𝑙𝑙𝑙𝑙𝑙𝑙𝑙

Modified Flows 2020 – Up per Snak e River Basin B-5

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B-6 Modified Flows 2020 – Upper Snake River Basin

Appendix C: Unregulated Flows Data

Table C-1. Unregulated flows into Brownlee Dam (BRN) for water years 1928 to 2018 (acre-feet per month)

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1928 1,279,592 1,557,644 1,232,387 1,229,026 936,517 2,045,679 2,041,802 5,145,847 2,760,507 1,604,438 1,015,034 959,374

1929 1,186,319 994,916 800,678 799,467 626,970 1,385,098 1,650,291 2,691,019 2,629,532 1,245,474 878,988 911,649

1930 1,017,801 944,899 854,949 650,459 965,934 1,080,333 1,591,638 2,233,785 2,023,478 1,071,817 998,652 901,206

1931 1,174,036 858,446 779,420 714,130 661,580 1,037,266 1,246,865 1,673,133 1,194,186 596,900 605,240 654,973

1932 773,644 731,605 689,563 613,920 600,141 1,655,609 2,211,930 3,813,082 3,543,531 1,469,924 867,206 830,748

1933 921,659 941,412 741,936 724,566 622,696 974,969 1,634,272 2,438,676 3,653,947 1,093,214 800,148 750,401

1934 835,296 845,228 835,761 978,288 713,999 1,028,708 1,528,824 1,532,407 976,941 613,057 524,258 577,858

1935 777,915 698,280 674,169 663,384 585,679 795,793 1,629,967 2,432,027 2,691,737 1,138,476 680,690 677,463

1936 795,785 812,562 652,971 749,048 827,001 1,106,858 2,939,247 4,348,143 3,066,887 1,186,440 887,280 855,955

1937 913,691 854,070 721,969 639,117 648,362 1,001,451 1,608,704 2,666,652 2,059,268 985,304 671,939 710,013

1938 909,461 896,403 1,174,028 903,734 843,164 1,744,345 2,806,616 4,368,597 4,020,962 1,968,238 970,994 900,855

1939 1,204,313 1,082,834 932,646 822,667 736,507 1,639,386 2,157,302 2,670,580 1,694,998 1,094,359 785,967 891,905

1940 1,014,224 840,159 819,407 855,706 1,132,697 1,642,505 2,336,933 2,823,492 1,949,231 915,669 693,783 965,327

1941 1,129,480 1,013,681 936,923 893,516 982,727 1,394,944 1,619,638 2,707,185 2,416,634 1,137,282 1,048,380 984,217

1942 1,172,050 1,160,135 1,232,572 820,645 941,868 1,177,357 2,591,895 3,031,857 2,944,389 1,407,240 862,709 909,785

1943 1,022,650 1,168,587 1,216,557 1,513,066 1,451,006 2,117,080 4,601,644 3,933,712 4,425,868 2,857,582 1,342,378 1,081,392

1944 1,350,549 1,181,821 975,159 829,547 861,573 1,051,948 1,471,639 2,107,536 2,621,124 1,290,345 849,021 873,387

1945 1,070,805 1,053,240 861,665 916,666 1,115,202 1,180,039 1,561,065 3,395,353 3,508,607 1,758,238 1,114,045 1,153,651

1946 1,286,551 1,179,265 1,183,083 1,057,384 918,079 2,096,762 3,439,982 4,032,538 2,929,300 1,453,767 1,013,604 1,128,242

1947 1,408,889 1,282,625 1,320,774 881,969 1,037,864 1,319,924 1,731,644 3,694,466 3,141,958 1,520,603 1,099,437 1,048,624

1948 1,249,793 1,130,786 1,049,348 1,027,640 912,178 1,028,169 1,861,815 3,494,812 3,513,292 1,338,376 1,007,119 1,028,865

1949 1,218,712 1,033,941 921,801 760,001 905,714 1,582,015 2,284,707 4,084,086 2,793,152 1,283,555 960,233 939,932

1950 1,283,655 1,048,481 889,027 918,018 997,134 1,508,196 2,309,594 3,336,365 4,414,239 2,531,273 1,301,664 1,232,975

1951 1,434,119 1,265,582 1,179,808 1,034,633 1,435,937 1,468,545 3,024,572 4,296,465 3,458,777 2,018,365 1,522,805 1,168,423

1952 1,492,100 1,225,788 1,304,805 1,071,648 1,015,758 1,509,407 5,029,826 5,917,514 3,855,068 1,807,735 1,208,890 1,136,668

1953 1,127,617 983,334 987,198 1,406,141 1,031,507 1,155,864 1,937,208 2,899,656 4,546,427 1,998,187 1,135,372 1,038,567

1954 1,121,188 1,106,931 998,256 1,024,390 1,005,745 1,236,406 2,062,207 3,703,364 3,060,430 1,857,259 1,139,543 1,041,028

1955 1,136,836 1,059,274 901,650 860,805 730,218 941,650 1,357,979 2,596,992 3,002,806 1,531,126 1,008,998 928,561

1956 1,019,847 1,118,051 1,779,067 1,488,032 1,002,835 1,566,915 2,889,801 4,918,627 4,512,930 1,847,670 1,225,683 1,091,119

1957 1,320,144 1,154,903 1,106,016 883,685 1,393,671 1,962,645 2,331,752 4,911,922 4,107,643 1,865,744 1,121,988 1,117,547

1958 1,236,724 1,057,192 1,102,143 936,521 1,438,461 1,373,050 2,499,282 4,942,956 3,205,604 1,269,270 1,040,477 1,037,764

1959 1,091,468 1,103,649 1,078,826 1,053,435 874,817 1,031,882 1,615,338 2,477,382 3,156,134 1,331,321 999,295 1,235,645

1960 1,437,956 1,051,052 949,484 890,588 942,660 1,504,489 2,039,253 2,575,906 2,588,938 1,009,700 920,764 949,657

1961 1,038,956 1,059,968 903,300 781,833 1,027,477 1,061,158 1,264,170 2,333,152 2,173,217 773,781 680,761 948,388

1962 1,200,377 965,955 862,844 811,930 1,271,084 1,156,275 2,507,352 3,368,597 3,288,807 1,626,774 1,065,145 952,700

Modified Flows 2020 – Up per Snak e River Basin C-1

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1963 1,335,230 1,160,497 1,138,246 905,972 1,566,255 1,011,905 1,527,778 3,016,242 3,469,047 1,388,419 958,946 1,134,794

1964 956,171 1,147,066 988,732 934,963 824,216 1,096,536 1,917,850 3,169,934 4,340,517 1,951,047 1,117,143 1,089,524

1965 1,093,032 1,152,453 2,434,095 1,961,400 1,641,766 1,473,578 3,195,644 4,432,237 5,036,027 2,632,878 1,639,073 1,401,469

1966 1,306,457 1,109,949 1,045,422 1,114,296 901,523 1,181,626 1,634,917 2,616,284 2,018,733 1,022,087 845,997 962,078

1967 1,107,738 1,039,445 995,749 1,094,630 896,648 1,039,405 1,279,698 3,040,387 4,445,954 2,090,893 1,090,165 1,074,585

1968 1,316,796 1,120,045 1,005,151 943,741 1,260,190 1,226,663 1,192,447 2,322,964 3,165,029 1,406,028 1,528,220 1,218,453

1969 1,231,825 1,186,567 1,047,639 1,548,296 1,086,949 1,468,923 3,662,736 4,506,788 3,094,665 1,520,264 1,081,149 1,155,221

1970 1,318,289 1,022,264 941,150 1,903,495 1,218,575 1,279,112 1,405,537 3,744,997 4,731,254 2,150,683 1,197,525 1,408,629

1971 1,331,848 1,353,148 1,379,978 2,371,949 1,401,625 1,885,373 3,253,433 5,912,738 5,658,205 2,872,430 1,521,128 1,444,357

1972 1,592,474 1,294,073 1,292,382 1,543,390 1,531,670 3,355,406 2,447,569 4,536,679 5,336,447 2,176,796 1,481,627 1,475,003

1973 1,567,132 1,260,762 1,210,362 1,270,723 1,023,112 1,284,614 1,691,183 2,980,896 2,515,575 1,370,199 1,054,919 1,267,700

1974 1,353,423 1,487,212 1,381,731 1,682,971 1,107,612 2,241,291 3,172,366 4,447,958 5,797,970 2,468,127 1,404,162 1,198,087

1975 1,377,316 1,143,652 1,125,724 1,106,686 1,113,214 1,604,750 2,024,045 3,929,636 5,145,062 3,185,007 1,514,329 1,286,080

1976 1,588,073 1,273,605 1,399,543 1,235,156 1,156,467 1,594,984 2,869,230 5,019,986 3,714,626 2,044,589 1,622,250 1,504,840

1977 1,406,133 1,011,615 980,798 965,340 825,863 860,645 922,235 1,265,376 1,265,626 692,617 746,808 866,057

1978 1,010,725 899,273 1,264,447 1,196,541 1,130,072 1,588,215 2,506,729 3,798,357 3,986,011 2,460,235 1,329,792 1,397,619

1979 1,198,517 1,001,478 982,016 1,003,295 1,113,343 1,511,311 1,501,484 3,175,975 2,472,751 1,183,525 1,090,877 974,397

1980 1,160,840 966,056 955,745 1,246,359 1,311,247 1,217,860 2,244,149 4,191,917 3,491,923 1,734,611 1,106,869 1,339,319

1981 1,199,991 1,116,681 1,294,606 1,120,868 1,269,169 1,268,035 1,876,933 2,862,780 2,866,707 1,104,606 873,713 943,484

1982 1,195,394 1,108,951 1,390,819 1,133,235 2,228,822 2,129,550 2,859,605 5,263,385 5,075,492 3,424,648 1,532,909 1,497,922

1983 1,598,908 1,360,986 1,483,742 1,586,450 1,694,578 3,290,188 3,047,808 5,308,024 5,217,817 2,864,936 1,715,108 1,454,544

1984 1,675,719 1,636,044 1,644,654 1,683,042 1,443,042 3,068,942 4,099,544 6,013,642 5,652,652 2,887,816 1,735,925 1,593,012

1985 1,623,865 1,474,172 1,317,073 1,219,638 1,149,671 1,544,936 2,937,010 3,629,205 2,313,243 1,287,620 1,124,888 1,487,284

1986 1,444,204 1,192,677 1,218,016 1,244,740 2,634,447 3,526,436 3,574,533 4,348,574 5,101,691 2,099,910 1,462,909 1,594,386

1987 1,519,710 1,255,267 1,097,055 1,026,913 1,035,891 1,348,835 1,598,010 2,331,606 1,466,043 1,134,371 979,899 1,020,798

1988 1,088,298 947,708 965,418 962,310 930,789 1,056,043 1,680,684 2,379,868 1,875,879 796,882 707,913 867,545

1989 948,293 963,711 912,751 887,957 905,168 2,164,918 2,931,605 3,459,860 2,839,552 1,370,708 1,106,322 1,112,709

1990 1,263,762 1,027,479 951,854 1,005,677 842,163 1,168,719 1,971,794 2,110,989 2,349,708 1,137,653 904,239 912,517

1991 1,130,076 935,555 825,291 907,070 855,627 991,718 1,208,763 2,562,731 2,616,764 1,166,489 895,023 1,036,342

1992 1,066,992 968,668 930,720 850,423 976,058 999,546 1,338,461 1,698,958 1,010,133 775,444 615,155 746,549

1993 812,029 747,415 778,750 831,301 767,537 2,135,424 2,494,523 4,612,466 3,663,150 1,715,853 1,362,484 1,094,674

1994 1,243,779 923,936 977,058 960,274 853,101 1,037,236 1,563,165 2,491,964 1,399,722 806,266 765,947 821,772

1995 1,003,549 826,183 955,506 1,166,899 1,270,865 1,790,892 2,079,383 4,007,828 4,451,322 2,565,964 1,315,408 1,215,693

1996 1,283,980 1,143,050 1,435,065 1,231,816 1,829,153 2,044,439 3,005,432 4,937,101 5,011,722 2,199,713 1,311,826 1,348,367

1997 1,296,505 1,290,131 1,842,903 2,965,841 1,520,844 2,213,102 3,367,803 6,391,798 5,702,919 2,601,725 1,749,272 1,524,376

1998 1,537,401 1,211,603 1,103,502 1,306,408 1,225,962 1,871,169 2,314,952 5,405,203 4,285,444 2,484,227 1,391,114 1,480,627

1999 1,388,330 1,149,840 1,171,477 1,323,830 1,341,040 2,266,660 2,677,904 4,527,220 5,120,911 2,304,579 1,484,574 1,339,347

2000 1,351,820 1,078,957 1,116,363 1,205,076 1,476,379 1,595,350 2,597,137 3,351,271 2,305,542 1,241,684 964,230 1,148,666

2001 1,248,263 964,453 960,275 950,030 897,189 1,225,329 1,368,763 2,154,087 1,222,191 883,440 767,176 808,465

2002 899,441 863,664 945,717 1,003,953 869,617 1,275,375 2,109,153 2,697,309 2,530,977 1,066,314 807,295 932,267

C-2 Modified Flows 2020 – Upper Snake River Basin

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

2003 937,887 798,283 912,056 1,113,389 1,038,237 1,255,827 1,712,707 3,098,911 2,624,740 969,168 784,264 857,082

2004 904,460 824,421 937,370 934,168 1,091,897 1,654,646 1,877,163 2,517,232 2,235,849 1,206,846 897,586 985,208

2005 1,078,666 857,241 961,058 926,330 801,510 1,086,187 1,505,617 3,512,038 2,349,247 1,176,892 824,942 905,773

2006 1,053,608 946,861 1,277,095 1,710,261 1,273,922 2,091,302 4,471,626 5,481,723 3,304,456 1,333,697 982,228 1,100,203

2007 1,203,967 1,046,622 1,097,612 982,026 1,037,076 1,481,438 1,662,512 2,410,413 1,418,707 803,653 750,961 898,140

2008 1,111,976 981,890 984,739 963,435 938,304 1,258,490 1,491,013 3,867,369 3,657,451 1,800,340 951,464 1,008,861

2009 1,110,098 976,875 911,253 1,021,950 898,952 1,298,737 1,785,872 3,611,855 3,820,074 1,712,541 1,112,930 1,040,205

2010 1,251,469 920,752 906,063 1,058,251 969,057 1,219,289 1,797,309 2,205,101 4,145,229 1,444,966 954,166 994,019

2011 1,145,599 933,026 1,177,163 1,377,185 1,020,934 1,793,648 2,632,003 4,869,015 5,805,827 3,542,952 1,471,958 1,264,243

2012 1,470,006 1,083,040 1,017,744 1,212,481 1,053,652 1,770,254 3,018,765 3,365,007 2,585,691 1,273,934 851,126 980,677

2013 1,085,822 971,512 1,254,959 903,023 939,642 1,152,681 1,451,998 2,456,639 1,622,639 852,855 698,756 1,006,776

2014 1,053,179 887,931 869,720 861,563 1,037,435 1,583,789 1,680,111 3,439,552 2,741,899 1,464,090 1,175,405 1,063,169

2015 1,175,128 972,689 1,189,375 1,135,707 1,409,485 1,324,869 1,520,142 2,502,402 1,729,711 972,256 802,915 910,372

2016 992,497 854,307 1,069,416 1,065,569 1,193,014 1,779,192 2,510,870 3,076,960 2,062,752 974,037 738,869 927,340

2017 1,199,439 1,002,150 981,607 1,086,996 2,092,859 3,470,512 3,992,209 5,492,617 4,987,197 2,060,611 1,263,348 1,380,772

2018 1,278,453 1,270,962 1,118,921 1,224,830 1,010,520 1,377,467 2,426,764 4,361,431 2,910,944 1,317,323 1,018,168 1,028,827

Table C-2. Unregulated flows into Brownlee Dam (BRN) for water years 1928 to 2018 (cfs)

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1928 20,810 26,177 20,043 19,988 16,281 33,269 34,313 83,688 46,391 26,093 16,508 16,123 1929 19,293 16,720 13,022 13,002 11,289 22,526 27,734 43,765 44,190 20,255 14,295 15,321 1930 16,553 15,879 13,904 10,579 17,392 17,570 26,748 36,329 34,005 17,431 16,241 15,145 1931 19,094 14,426 12,676 11,614 11,912 16,869 20,954 27,211 20,069 9,708 9,843 11,007 1932 12,582 12,295 11,214 9,984 10,433 26,926 37,172 62,013 59,550 23,906 14,104 13,961 1933 14,989 15,821 12,066 11,784 11,212 15,856 27,464 39,661 61,406 17,779 13,013 12,611 1934 13,585 14,204 13,592 15,910 12,856 16,730 25,692 24,922 16,418 9,970 8,526 9,711 1935 12,651 11,735 10,964 10,789 10,546 12,942 27,392 39,553 45,235 18,515 11,070 11,385 1936 12,942 13,655 10,619 12,182 14,377 18,001 49,395 70,715 51,540 19,295 14,430 14,385 1937 14,860 14,353 11,742 10,394 11,674 16,287 27,035 43,368 34,607 16,024 10,928 11,932 1938 14,791 15,064 19,093 14,698 15,182 28,369 47,166 71,047 67,574 32,010 15,791 15,139 1939 19,586 18,197 15,168 13,379 13,261 26,662 36,254 43,432 28,485 17,798 12,782 14,989 1940 16,495 14,119 13,326 13,917 19,692 26,712 39,273 45,919 32,757 14,892 11,283 16,223 1941 18,369 17,035 15,237 14,531 17,695 22,686 27,219 44,028 40,612 18,496 17,050 16,540 1942 19,061 19,496 20,046 13,346 16,959 19,148 43,558 49,308 49,481 22,886 14,030 15,289 1943 16,632 19,638 19,785 24,607 26,126 34,431 77,332 63,975 74,378 46,473 21,831 18,173 1944 21,964 19,861 15,859 13,491 14,978 17,108 24,731 34,275 44,049 20,985 13,808 14,678 1945 17,415 17,700 14,013 14,908 20,080 19,191 26,234 55,219 58,963 28,595 18,118 19,387 1946 20,923 19,818 19,241 17,196 16,531 34,100 57,810 65,582 49,228 23,643 16,484 18,960 1947 22,913 21,555 21,480 14,344 18,687 21,466 29,101 60,084 52,802 24,730 17,880 17,622 1948 20,326 19,003 17,066 16,713 15,858 16,721 31,288 56,837 59,042 21,766 16,379 17,290

Modified Flows 2020 – Up per Snak e River Basin C-3

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1949 19,820 17,376 14,991 12,360 16,308 25,729 38,395 66,420 46,940 20,875 15,616 15,796 1950 20,876 17,620 14,458 14,930 17,954 24,528 38,813 54,260 74,183 41,167 21,169 20,721 1951 23,323 21,268 19,187 16,826 25,855 23,883 50,829 69,874 58,126 32,825 24,766 19,636 1952 24,266 20,600 21,220 17,428 17,659 24,548 84,528 96,238 64,786 29,400 19,660 19,102 1953 18,339 16,525 16,055 22,868 18,573 18,798 32,555 47,158 76,404 32,497 18,465 17,453 1954 18,234 18,602 16,235 16,660 18,109 20,108 34,656 60,229 51,431 30,205 18,533 17,495 1955 18,489 17,801 14,664 13,999 13,148 15,314 22,821 42,235 50,463 24,901 16,410 15,605 1956 16,586 18,789 28,933 24,200 17,434 25,483 48,564 79,993 75,841 30,049 19,934 18,337 1957 21,470 19,409 17,987 14,372 25,094 31,919 39,186 79,884 69,030 30,343 18,247 18,781 1958 20,113 17,766 17,924 15,231 25,900 22,330 42,001 80,388 53,871 20,642 16,921 17,440 1959 17,751 18,547 17,545 17,132 15,752 16,782 27,146 40,290 53,040 21,652 16,252 20,765 1960 23,386 17,663 15,442 14,484 16,388 24,468 34,270 41,892 43,508 16,421 14,975 15,959 1961 16,897 17,813 14,691 12,715 18,500 17,258 21,245 37,945 36,522 12,584 11,071 15,938 1962 19,522 16,233 14,033 13,205 22,887 18,805 42,137 54,784 55,269 26,457 17,323 16,010 1963 21,715 19,503 18,512 14,734 28,202 16,457 25,675 49,054 58,298 22,580 15,596 19,071 1964 15,550 19,277 16,080 15,206 14,329 17,833 32,230 51,553 72,944 31,730 18,168 18,310 1965 17,776 19,367 39,586 31,899 29,561 23,965 53,704 72,082 84,632 42,819 26,657 23,552 1966 21,247 18,653 17,002 18,122 16,233 19,217 27,475 42,549 33,925 16,622 13,759 16,168 1967 18,015 17,468 16,194 17,802 16,145 16,904 21,506 49,446 74,716 34,005 17,730 18,059 1968 21,415 18,823 16,347 15,348 21,908 19,949 20,039 37,779 53,189 22,867 24,854 20,476 1969 20,033 19,941 17,038 25,180 19,571 23,889 61,553 73,295 52,007 24,724 17,583 19,414 1970 21,440 17,179 15,306 30,957 21,941 20,802 23,620 60,906 79,510 34,977 19,476 23,672 1971 21,660 22,740 22,443 38,575 25,237 30,662 54,675 96,160 95,088 46,715 24,738 24,273 1972 25,899 21,747 21,018 25,100 26,628 54,570 41,132 73,781 89,681 35,402 24,096 24,788 1973 25,487 21,187 19,684 20,666 18,422 20,892 28,421 48,479 42,275 22,284 17,156 21,304 1974 22,011 24,993 22,471 27,370 19,943 36,451 53,313 72,338 97,437 40,140 22,836 20,134 1975 22,400 19,219 18,308 17,998 20,044 26,098 34,015 63,908 86,464 51,798 24,628 21,613 1976 25,827 21,403 22,761 20,088 20,105 25,940 48,218 81,641 62,425 33,252 26,383 25,289 1977 22,868 17,000 15,951 15,700 14,870 13,997 15,498 20,579 21,269 11,264 12,145 14,554 1978 16,438 15,113 20,564 19,460 20,348 25,829 42,126 61,773 66,986 40,011 21,627 23,487 1979 19,492 16,830 15,971 16,317 20,047 24,579 25,233 51,652 41,555 19,248 17,741 16,375 1980 18,879 16,235 15,543 20,270 22,796 19,806 37,714 68,174 58,683 28,210 18,001 22,508 1981 19,516 18,766 21,054 18,229 22,852 20,622 31,542 46,558 48,176 17,964 14,209 15,856 1982 19,441 18,636 22,619 18,430 40,131 34,633 48,057 85,599 85,295 55,696 24,930 25,173 1983 26,003 22,872 24,130 25,801 30,512 53,509 51,219 86,325 87,687 46,593 27,893 24,444 1984 27,253 27,494 26,747 27,372 25,087 49,911 68,894 97,801 94,995 46,965 28,232 26,771 1985 26,409 24,774 21,420 19,835 20,701 25,126 49,357 59,022 38,875 20,941 18,294 24,994 1986 23,487 20,043 19,809 20,243 47,435 57,351 60,071 70,722 85,735 34,151 23,792 26,794 1987 24,715 21,095 17,842 16,701 18,652 21,936 26,855 37,919 24,637 18,449 15,936 17,155 1988 17,699 15,927 15,701 15,650 16,182 17,175 28,244 38,704 31,525 12,960 11,513 14,579

C-4 Modified Flows 2020 – Upper Snake River Basin

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1989 15,422 16,195 14,844 14,441 16,298 35,209 49,267 56,268 47,720 22,292 17,992 18,699 1990 20,553 17,267 15,480 16,356 15,164 19,007 33,137 34,331 39,488 18,502 14,706 15,335 1991 18,379 15,722 13,422 14,752 15,406 16,129 20,314 41,678 43,976 18,971 14,556 17,416 1992 17,353 16,279 15,136 13,831 16,969 16,256 22,493 27,630 16,976 12,611 10,004 12,546 1993 13,206 12,561 12,665 13,520 13,820 34,729 41,921 75,013 61,560 27,905 22,158 18,396 1994 20,228 15,527 15,890 15,617 15,361 16,869 26,269 40,527 23,523 13,112 12,457 13,810 1995 16,321 13,884 15,540 18,978 22,883 29,126 34,945 65,180 74,806 41,731 21,393 20,430 1996 20,882 19,209 23,339 20,033 31,799 33,249 50,507 80,293 84,224 35,774 21,334 22,660 1997 21,085 21,681 29,972 48,234 27,384 35,992 56,597 103,951 95,839 42,312 28,449 25,618 1998 25,003 20,361 17,946 21,246 22,074 30,431 38,903 87,906 72,018 40,401 22,624 24,882 1999 22,579 19,323 19,052 21,530 24,146 36,863 45,003 73,627 86,059 37,480 24,144 22,508 2000 21,985 18,132 18,156 19,598 25,667 25,945 43,646 54,502 38,745 20,194 15,681 19,304 2001 20,301 16,208 15,617 15,451 16,155 19,928 23,002 35,032 20,539 14,368 12,477 13,586 2002 14,628 14,514 15,380 16,327 15,658 20,742 35,445 43,867 42,534 17,342 13,129 15,667 2003 15,253 13,415 14,833 18,107 18,694 20,424 28,783 50,398 44,110 15,762 12,755 14,404 2004 14,709 13,855 15,245 15,193 18,982 26,910 31,546 40,938 37,574 19,627 14,598 16,557 2005 17,543 14,406 15,630 15,065 14,432 17,665 25,302 57,117 39,480 19,140 13,416 15,222 2006 17,135 15,912 20,770 27,814 22,938 34,011 75,147 89,150 55,532 21,690 15,974 18,489 2007 19,580 17,589 17,851 15,971 18,673 24,093 27,939 39,201 23,842 13,070 12,213 15,094 2008 18,084 16,501 16,015 15,669 16,312 20,467 25,057 62,896 61,465 29,279 15,474 16,954 2009 18,054 16,417 14,820 16,620 16,186 21,122 30,012 58,740 64,198 27,851 18,100 17,481 2010 20,353 15,474 14,735 17,211 17,449 19,830 30,204 35,862 69,662 23,500 15,518 16,705 2011 18,631 15,680 19,144 22,397 18,383 29,170 44,232 79,186 97,569 57,620 23,939 21,246 2012 23,907 18,201 16,552 19,719 18,318 28,790 50,731 54,726 43,453 20,718 13,842 16,481 2013 17,659 16,327 20,410 14,686 16,919 18,746 24,401 39,953 27,269 13,870 11,364 16,919 2014 17,128 14,922 14,144 14,012 18,680 25,757 28,235 55,938 46,078 23,811 19,116 17,867 2015 19,111 16,346 19,343 18,470 25,379 21,547 25,546 40,697 29,068 15,812 13,058 15,299 2016 16,141 14,357 17,392 17,330 20,740 28,935 42,196 50,041 34,665 15,841 12,016 15,584 2017 19,507 16,841 15,964 17,678 37,683 56,442 67,090 89,328 83,811 33,512 20,546 23,204 2018 20,792 21,359 18,197 19,920 18,195 22,402 40,783 70,931 48,919 21,424 16,559 17,290

Modified Flows 2020 – Up per Snak e River Basin C-5

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C-6 Modified Flows 2020 – Upper Snake River Basin

Appendix D: Modified Flows Data

Table D-1. Modified flows into Brownlee Dam (BRN) for water years 1928 to 2018 (acre-feet per month)

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1928 675,341 1,016,559 1,076,434 1,107,357 896,328 1,635,183 1,646,751 2,301,881 911,698 589,537 488,668 598,585

1929 708,126 781,807 748,242 719,243 550,897 1,136,689 1,008,714 978,837 817,484 466,267 440,187 490,271

1930 595,715 768,198 730,130 616,082 848,203 801,061 710,523 897,935 653,707 448,161 477,820 512,131

1931 639,784 722,670 705,015 678,844 579,125 814,661 664,624 596,580 434,678 375,415 369,316 402,701

1932 493,583 639,653 655,608 616,150 591,343 1,379,712 1,430,544 1,692,966 1,273,521 564,231 428,492 514,983

1933 620,917 724,157 707,381 628,614 565,638 816,488 925,548 1,066,504 1,339,135 496,387 447,775 514,497

1934 598,322 738,684 731,852 833,221 648,103 736,877 724,725 570,578 421,759 367,533 344,168 387,004

1935 485,186 606,540 629,477 601,783 528,720 641,736 847,489 843,619 733,831 405,937 377,234 392,992

1936 514,767 665,451 603,332 651,152 692,264 884,470 1,655,083 1,630,978 1,033,818 507,300 468,670 544,654

1937 607,587 666,071 677,374 592,981 556,410 776,076 960,148 922,228 696,756 440,819 428,907 485,143

1938 597,871 747,446 937,230 752,294 748,573 1,414,188 1,890,446 2,388,335 1,532,123 906,042 509,227 582,468

1939 729,723 771,810 746,795 656,527 599,032 1,198,285 1,052,096 912,408 576,986 480,602 467,094 563,210

1940 630,528 694,409 703,419 708,156 916,786 1,223,460 1,434,966 1,212,917 705,891 487,488 458,655 634,845

1941 696,439 764,690 777,058 751,887 821,977 1,077,044 928,247 1,053,083 947,188 557,873 572,807 617,286

1942 708,841 843,562 928,955 786,726 827,404 916,742 1,594,422 1,524,985 1,129,013 616,920 516,470 614,575

1943 695,118 845,128 1,038,477 1,374,179 1,319,538 1,829,905 3,148,830 2,265,394 1,711,906 1,109,761 645,167 678,069

1944 810,481 842,189 788,131 711,090 700,487 791,537 839,343 888,892 939,691 566,170 550,105 600,079

1945 700,618 826,361 732,183 755,197 900,501 890,064 974,753 1,572,702 1,392,932 672,199 568,926 663,862

1946 737,207 836,342 927,774 883,537 730,089 1,769,639 2,224,488 1,898,397 1,094,005 693,795 582,043 720,382

1947 857,446 904,942 1,009,638 746,267 836,735 940,306 1,139,549 1,593,003 1,184,760 619,221 573,845 688,439

1948 801,363 818,844 822,496 834,475 748,333 786,575 988,778 1,640,130 1,322,721 629,867 571,686 683,146

1949 795,053 772,195 766,850 664,735 807,346 1,245,212 1,183,023 1,704,194 940,552 578,806 542,803 636,418

1950 778,691 803,741 739,848 747,921 784,703 1,367,704 1,840,671 1,643,107 1,415,472 891,535 601,636 685,054

1951 846,841 861,675 1,071,055 1,200,691 1,507,113 1,847,953 2,786,403 2,381,325 1,176,569 971,450 747,917 694,782

1952 916,363 880,516 1,027,418 1,140,449 1,164,502 1,591,193 4,521,067 3,508,878 1,467,919 1,135,129 710,881 740,646

1953 814,194 786,876 764,985 1,145,432 919,564 942,203 1,230,526 1,499,243 1,971,455 895,465 827,484 697,817

1954 810,722 840,699 822,772 819,382 835,550 932,311 1,288,935 1,504,879 1,126,680 929,552 631,365 660,237

1955 804,702 803,762 791,457 732,545 625,655 762,467 810,453 966,424 895,459 850,776 544,363 583,759

1956 700,864 791,988 1,275,041 1,252,581 970,878 1,608,682 2,312,248 2,633,410 1,805,797 903,084 763,437 685,267

1957 894,428 870,870 890,108 757,697 1,146,600 1,889,370 2,063,686 2,740,247 1,493,235 846,728 740,397 698,187

1958 835,130 781,570 848,058 875,478 1,276,598 1,277,796 1,878,748 2,473,268 1,424,529 931,466 685,686 695,495

1959 808,785 823,550 822,170 829,174 735,761 772,060 814,627 946,844 948,533 817,651 619,983 793,268

1960 860,519 777,497 766,178 706,484 813,428 1,144,485 949,529 1,073,919 907,529 719,501 590,794 617,926

1961 725,733 791,216 760,403 661,100 814,768 836,593 670,616 780,990 664,443 524,670 453,335 516,031

1962 656,650 692,825 702,333 637,504 963,839 804,182 988,876 1,047,729 984,666 814,732 589,506 596,725

1963 852,931 842,499 880,168 728,175 1,129,868 759,552 888,139 1,238,053 1,231,084 835,905 612,142 668,089

Modified Flows 2020 – Up per Snak e River Basin D-1

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

1964 756,880 834,930 799,061 733,521 683,473 837,521 1,092,251 1,232,670 1,550,627 743,123 731,899 666,260

1965 791,287 839,360 1,895,898 1,924,293 1,656,636 1,726,042 3,047,519 2,872,604 1,869,813 1,079,563 1,085,736 745,552

1966 817,889 814,535 798,750 1,166,079 973,150 1,092,835 875,711 772,835 623,987 744,653 524,324 580,138

1967 726,786 754,304 790,310 819,708 703,122 739,124 689,070 1,148,299 1,408,094 868,921 568,761 613,899

1968 801,866 815,743 781,634 878,878 1,092,985 990,374 750,161 680,840 717,422 723,699 720,480 638,083

1969 798,804 845,698 812,888 1,411,138 1,101,362 1,452,826 2,756,808 2,239,846 1,140,608 962,449 597,049 668,870

1970 827,428 769,560 687,483 1,591,351 1,056,780 1,076,866 1,240,607 1,809,817 1,946,486 1,017,098 719,551 777,550

1971 844,341 916,020 1,096,059 2,625,922 1,647,494 2,480,730 3,366,661 3,984,475 2,431,345 1,161,828 945,384 718,267

1972 911,567 851,130 1,424,101 1,965,068 1,742,739 3,688,893 2,408,370 2,500,996 2,199,573 1,033,173 791,764 760,941

1973 875,001 868,186 1,144,667 1,489,573 1,126,909 1,277,162 986,280 940,735 694,132 769,833 545,788 708,892

1974 829,052 960,613 1,037,638 1,596,191 1,154,265 2,690,645 3,248,119 2,707,298 2,442,472 1,151,382 818,437 665,643

1975 868,688 857,404 851,723 1,156,578 1,200,329 1,817,978 2,004,521 2,259,336 1,970,599 1,340,170 893,099 685,291

1976 881,725 884,007 1,404,315 1,484,798 1,215,422 2,074,383 2,836,889 2,661,229 1,449,751 839,105 915,199 834,237

1977 802,295 865,900 1,089,705 1,139,476 793,951 742,823 435,673 557,443 557,432 383,502 379,383 452,321

1978 603,739 651,616 851,605 888,495 876,007 1,190,646 1,450,800 1,587,498 1,146,386 706,860 798,074 735,637

1979 692,372 726,947 719,046 1,026,555 1,074,129 1,378,299 961,896 934,686 728,553 667,263 527,488 583,888

1980 676,990 725,773 705,928 1,037,379 1,078,668 1,056,159 1,522,262 1,914,943 1,556,556 818,101 553,028 744,117

1981 743,234 780,507 905,320 1,029,256 1,169,852 1,147,952 1,065,119 1,102,011 987,337 657,254 479,724 580,436

1982 721,711 777,442 1,015,858 1,029,370 2,023,100 2,356,253 2,905,898 3,202,178 2,175,851 1,447,070 969,862 784,101

1983 864,410 1,014,547 1,644,234 1,963,621 1,937,537 3,446,811 3,118,298 3,428,485 2,395,297 1,352,723 947,116 718,018

1984 880,323 1,150,620 1,682,315 2,072,651 1,767,668 3,437,713 4,021,345 3,801,384 2,989,324 1,267,334 1,078,840 803,370

1985 916,241 1,336,653 1,377,530 1,490,861 1,248,451 1,498,989 2,051,137 1,402,394 919,040 758,056 592,047 856,788

1986 885,603 828,841 871,217 1,095,575 2,529,597 3,886,721 3,247,094 2,599,262 2,077,375 926,916 837,451 843,307

1987 988,486 1,163,981 1,219,383 1,185,958 979,357 1,127,146 731,449 662,374 670,216 612,993 536,883 599,240

1988 688,457 688,045 721,160 687,267 718,240 755,923 668,499 638,318 645,798 490,826 431,872 521,037

1989 591,409 680,058 689,715 659,129 697,692 1,559,888 1,615,616 1,125,196 794,200 648,171 552,121 656,026

1990 768,562 725,789 699,896 710,641 643,838 895,215 837,045 796,042 858,413 474,139 470,367 559,119

1991 697,060 690,160 675,146 696,352 629,400 647,193 576,536 739,968 611,139 589,221 433,268 547,765

1992 631,003 662,735 684,502 636,472 715,433 645,997 499,595 434,252 393,263 358,018 281,965 365,815

1993 495,181 570,689 576,506 629,908 570,537 1,526,228 1,599,744 1,854,961 1,320,412 763,570 657,851 648,483

1994 761,848 675,682 699,424 699,462 734,198 880,831 719,472 770,497 572,812 410,398 412,588 470,591

1995 626,326 614,750 692,500 872,699 885,183 1,222,320 1,205,255 1,961,530 1,549,277 854,481 869,204 667,605

1996 747,267 716,021 898,220 1,486,161 2,007,366 2,735,927 3,007,369 2,801,810 2,017,431 1,063,695 783,404 739,120

1997 781,779 799,104 1,340,426 3,099,427 2,007,186 2,796,590 3,276,671 3,993,335 3,083,214 984,646 1,024,648 758,532

1998 855,589 978,175 1,188,085 1,515,926 1,336,090 1,978,795 2,101,871 3,093,737 1,814,879 1,154,573 857,537 806,022

1999 835,896 752,335 1,045,793 1,547,950 1,402,998 2,639,087 2,547,806 2,391,478 2,179,796 1,120,891 779,283 702,135

2000 823,467 734,415 1,010,376 1,449,180 1,499,835 1,462,802 1,507,080 1,295,564 986,168 784,686 507,460 703,225

2001 783,847 721,765 713,890 694,796 734,958 941,545 702,750 748,125 655,510 546,976 446,921 490,387

2002 585,285 617,532 720,619 761,520 665,695 892,428 1,064,627 971,938 833,946 613,645 465,053 582,049

2003 589,266 579,269 675,153 810,167 775,880 820,296 826,355 1,234,780 892,644 572,924 458,343 530,262

D-2 Modified Flows 2020 – Upper Snake River Basin

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep

2004 597,507 606,612 679,073 716,305 829,535 1,127,706 836,503 925,686 796,945 537,873 453,846 544,711

2005 627,069 620,842 695,158 672,263 587,901 745,850 700,997 1,294,759 808,125 508,565 438,344 527,158

2006 632,420 656,784 901,375 1,321,196 1,079,760 1,721,771 3,177,872 2,533,689 1,441,814 738,314 548,945 645,965

2007 745,975 693,822 762,351 824,254 825,259 1,061,926 769,206 791,918 606,036 568,656 459,251 547,278

2008 649,453 681,029 703,465 711,748 689,834 904,400 854,153 1,577,603 1,130,429 685,895 601,993 620,082

2009 693,265 670,862 659,378 750,168 636,259 1,002,009 1,173,552 1,395,649 1,219,962 775,647 656,264 610,618

2010 732,271 655,034 662,788 957,978 924,762 1,121,135 1,009,716 981,612 1,517,232 843,978 531,681 610,417

2011 707,220 681,582 821,267 1,049,818 786,208 2,042,160 2,426,602 2,941,381 2,839,762 1,546,592 873,861 666,101

2012 862,444 721,463 982,269 1,431,381 1,144,899 1,601,896 2,044,765 1,521,240 856,120 849,988 495,746 608,291

2013 671,908 666,131 869,611 655,981 729,745 828,293 677,519 689,789 588,199 510,911 399,753 555,471

2014 642,685 647,079 658,431 626,988 723,863 1,084,697 822,912 1,065,808 688,579 699,756 514,449 513,999

2015 663,045 656,324 824,874 847,443 1,049,725 964,819 660,768 617,388 514,200 590,100 403,586 501,630

2016 599,456 612,263 757,703 780,751 901,713 1,175,606 1,180,031 1,177,684 663,576 678,582 439,745 594,024

2017 672,701 639,398 683,104 827,794 1,671,052 3,062,014 3,802,554 3,396,868 2,061,080 879,399 788,466 734,174

2018 768,112 752,818 713,632 1,197,860 1,030,246 1,647,458 1,955,630 1,935,692 1,181,438 706,378 543,461 612,330

Table D-2. Modified flows into Brownlee Dam (BRN) for water years 1928 to 2018 (cfs)

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1928 10,983 17,084 17,507 18,009 15,583 26,594 27,675 37,437 15,322 9,588 7,947 10,060 1929 11,517 13,139 12,169 11,697 9,919 18,486 16,952 15,919 13,738 7,583 7,159 8,239 1930 9,688 12,910 11,874 10,020 15,273 13,028 11,941 14,604 10,986 7,289 7,771 8,607 1931 10,405 12,145 11,466 11,040 10,428 13,249 11,169 9,702 7,305 6,106 6,006 6,768 1932 8,027 10,750 10,662 10,021 10,281 22,439 24,041 27,533 21,402 9,176 6,969 8,655 1933 10,098 12,170 11,504 10,223 10,185 13,279 15,554 17,345 22,505 8,073 7,282 8,646 1934 9,731 12,414 11,902 13,551 11,670 11,984 12,179 9,280 7,088 5,977 5,597 6,504 1935 7,891 10,193 10,237 9,787 9,520 10,437 14,243 13,720 12,332 6,602 6,135 6,604 1936 8,372 11,183 9,812 10,590 12,035 14,385 27,815 26,525 17,374 8,250 7,622 9,153 1937 9,881 11,194 11,016 9,644 10,019 12,622 16,136 14,999 11,709 7,169 6,976 8,153 1938 9,723 12,561 15,243 12,235 13,479 23,000 31,770 38,843 25,748 14,735 8,282 9,789 1939 11,868 12,971 12,145 10,677 10,786 19,488 17,681 14,839 9,697 7,816 7,597 9,465 1940 10,255 11,670 11,440 11,517 15,938 19,898 24,115 19,726 11,863 7,928 7,459 10,669 1941 11,327 12,851 12,638 12,228 14,800 17,516 15,600 17,127 15,918 9,073 9,316 10,374 1942 11,528 14,177 15,108 12,795 14,898 14,909 26,795 24,802 18,974 10,033 8,400 10,328 1943 11,305 14,203 16,889 22,349 23,760 29,761 52,918 36,843 28,770 18,049 10,493 11,395 1944 13,181 14,153 12,818 11,565 12,178 12,873 14,106 14,456 15,792 9,208 8,947 10,085 1945 11,394 13,887 11,908 12,282 16,214 14,476 16,381 25,578 23,409 10,932 9,253 11,157 1946 11,990 14,055 15,089 14,369 13,146 28,780 37,384 30,874 18,385 11,283 9,466 12,106 1947 13,945 15,208 16,420 12,137 15,066 15,293 19,151 25,908 19,911 10,071 9,333 11,570 1948 13,033 13,761 13,377 13,571 13,010 12,792 16,617 26,674 22,229 10,244 9,298 11,481 1949 12,930 12,977 12,472 10,811 14,537 20,251 19,881 27,716 15,807 9,413 8,828 10,695

Modified Flows 2020 – Up per Snak e River Basin D-3

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1950 12,664 13,507 12,032 12,164 14,129 22,244 30,934 26,723 23,788 14,499 9,785 11,513 1951 13,773 14,481 17,419 19,527 27,137 30,054 46,827 38,729 19,773 15,799 12,164 11,676 1952 14,903 14,798 16,709 18,548 20,245 25,878 75,979 57,066 24,669 18,461 11,561 12,447 1953 13,242 13,224 12,441 18,629 16,558 15,323 20,680 24,383 33,131 14,563 13,458 11,727 1954 13,185 14,128 13,381 13,326 15,045 15,163 21,661 24,475 18,934 15,118 10,268 11,096 1955 13,087 13,508 12,872 11,914 11,266 12,400 13,620 15,717 15,049 13,837 8,853 9,810 1956 11,398 13,310 20,737 20,371 16,879 26,163 38,859 42,828 30,347 14,687 12,416 11,516 1957 14,546 14,635 14,476 12,323 20,646 30,728 34,681 44,566 25,095 13,771 12,041 11,733 1958 13,582 13,135 13,792 14,238 22,986 20,781 31,573 40,224 23,940 15,149 11,152 11,688 1959 13,154 13,840 13,371 13,485 13,248 12,556 13,690 15,399 15,941 13,298 10,083 13,331 1960 13,995 13,066 12,461 11,490 14,141 18,613 15,957 17,466 15,252 11,702 9,608 10,385 1961 11,803 13,297 12,367 10,752 14,671 13,606 11,270 12,702 11,166 8,533 7,373 8,672 1962 10,679 11,643 11,422 10,368 17,355 13,079 16,619 17,040 16,548 13,250 9,587 10,028 1963 13,872 14,159 14,315 11,843 20,344 12,353 14,926 20,135 20,689 13,595 9,956 11,228 1964 12,309 14,031 12,995 11,930 11,882 13,621 18,356 20,047 26,059 12,086 11,903 11,197 1965 12,869 14,106 30,834 31,296 29,829 28,071 51,215 46,718 31,423 17,557 17,658 12,529 1966 13,302 13,689 12,990 18,964 17,523 17,773 14,717 12,569 10,486 12,111 8,527 9,750 1967 11,820 12,677 12,853 13,331 12,660 12,021 11,580 18,675 23,664 14,132 9,250 10,317 1968 13,041 13,709 12,712 14,294 19,002 16,107 12,607 11,073 12,057 11,770 11,717 10,723 1969 12,991 14,212 13,220 22,950 19,831 23,628 46,330 36,428 19,169 15,653 9,710 11,241 1970 13,457 12,933 11,181 25,881 19,028 17,514 20,849 29,434 32,712 16,542 11,702 13,067 1971 13,732 15,394 17,826 42,707 29,665 40,345 56,579 64,801 40,860 18,895 15,375 12,071 1972 14,825 14,304 23,161 31,959 30,298 59,994 40,474 40,675 36,965 16,803 12,877 12,788 1973 14,231 14,590 18,616 24,226 20,291 20,771 16,575 15,300 11,665 12,520 8,876 11,913 1974 13,483 16,144 16,876 25,960 20,784 43,759 54,586 44,030 41,047 18,725 13,311 11,187 1975 14,128 14,409 13,852 18,810 21,613 29,567 33,687 36,745 33,117 21,796 14,525 11,517 1976 14,340 14,856 22,839 24,148 21,130 33,737 47,676 43,281 24,364 13,647 14,884 14,020 1977 13,048 14,552 17,722 18,532 14,296 12,081 7,322 9,066 9,368 6,237 6,170 7,602 1978 9,819 10,951 13,850 14,450 15,773 19,364 24,382 25,818 19,266 11,496 12,979 12,363 1979 11,260 12,217 11,694 16,695 19,341 22,416 16,165 15,201 12,244 10,852 8,579 9,813 1980 11,010 12,197 11,481 16,871 18,753 17,177 25,582 31,144 26,159 13,305 8,994 12,505 1981 12,088 13,117 14,724 16,739 21,064 18,670 17,900 17,922 16,593 10,689 7,802 9,755 1982 11,738 13,065 16,521 16,741 36,428 38,321 48,835 52,078 36,566 23,534 15,773 13,177 1983 14,058 17,050 26,741 31,935 34,887 56,057 52,405 55,759 40,254 22,000 15,403 12,067 1984 14,317 19,337 27,360 33,708 30,731 55,909 67,581 61,824 50,237 20,611 17,546 13,501 1985 14,901 22,463 22,403 24,247 22,480 24,379 34,471 22,808 15,445 12,329 9,629 14,399 1986 14,403 13,929 14,169 17,818 45,548 63,211 54,569 42,273 34,911 15,075 13,620 14,172 1987 16,076 19,561 19,831 19,288 17,634 18,331 12,292 10,772 11,263 9,969 8,732 10,071 1988 11,197 11,563 11,729 11,177 12,487 12,294 11,235 10,381 10,853 7,983 7,024 8,756 1989 9,618 11,429 11,217 10,720 12,563 25,369 27,151 18,300 13,347 10,541 8,979 11,025

D-4 Modified Flows 2020 – Upper Snake River Basin

Year Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep 1990 12,499 12,197 11,383 11,557 11,593 14,559 14,067 12,946 14,426 7,711 7,650 9,396 1991 11,337 11,599 10,980 11,325 11,333 10,526 9,689 12,034 10,271 9,583 7,046 9,205 1992 10,262 11,138 11,132 10,351 12,438 10,506 8,396 7,062 6,609 5,823 4,586 6,148 1993 8,053 9,591 9,376 10,244 10,273 24,822 26,885 30,168 22,190 12,418 10,699 10,898 1994 12,390 11,355 11,375 11,376 13,220 14,325 12,091 12,531 9,626 6,674 6,710 7,909 1995 10,186 10,331 11,262 14,193 15,939 19,879 20,255 31,901 26,036 13,897 14,136 11,219 1996 12,153 12,033 14,608 24,170 34,898 44,496 50,541 45,567 33,904 17,299 12,741 12,421 1997 12,714 13,429 21,800 50,407 36,141 45,482 55,066 64,945 51,815 16,014 16,664 12,748 1998 13,915 16,439 19,322 24,654 24,058 32,182 35,323 50,315 30,500 18,777 13,947 13,546 1999 13,595 12,643 17,008 25,175 25,262 42,921 42,817 38,894 36,633 18,230 12,674 11,800 2000 13,392 12,342 16,432 23,569 26,075 23,790 25,327 21,070 16,573 12,762 8,253 11,818 2001 12,748 12,130 11,610 11,300 13,234 15,313 11,810 12,167 11,016 8,896 7,268 8,241 2002 9,519 10,378 11,720 12,385 11,986 14,514 17,892 15,807 14,015 9,980 7,563 9,782 2003 9,583 9,735 10,980 13,176 13,970 13,341 13,887 20,082 15,001 9,318 7,454 8,911 2004 9,718 10,194 11,044 11,650 14,422 18,340 14,058 15,055 13,393 8,748 7,381 9,154 2005 10,198 10,434 11,306 10,933 10,586 12,130 11,781 21,057 13,581 8,271 7,129 8,859 2006 10,285 11,038 14,659 21,487 19,442 28,002 53,406 41,207 24,230 12,008 8,928 10,856 2007 12,132 11,660 12,398 13,405 14,860 17,271 12,927 12,879 10,185 9,248 7,469 9,197 2008 10,562 11,445 11,441 11,575 11,993 14,709 14,355 25,657 18,997 11,155 9,790 10,421 2009 11,275 11,274 10,724 12,200 11,456 16,296 19,722 22,698 20,502 12,615 10,673 10,262 2010 11,909 11,008 10,779 15,580 16,651 18,234 16,969 15,964 25,498 13,726 8,647 10,258 2011 11,502 11,454 13,357 17,074 14,156 33,213 40,780 47,837 47,724 25,153 14,212 11,194 2012 14,026 12,125 15,975 23,279 19,904 26,052 34,363 24,741 14,388 13,824 8,063 10,223 2013 10,928 11,195 14,143 10,669 13,140 13,471 11,386 11,218 9,885 8,309 6,501 9,335 2014 10,452 10,875 10,708 10,197 13,034 17,641 13,830 17,334 11,572 11,380 8,367 8,638 2015 10,783 11,030 13,415 13,782 18,901 15,691 11,105 10,041 8,641 9,597 6,564 8,430 2016 9,749 10,289 12,323 12,698 15,676 19,119 19,831 19,153 11,152 11,036 7,152 9,983 2017 10,940 10,745 11,110 13,463 30,089 49,799 63,904 55,245 34,638 14,302 12,823 12,338 2018 12,492 12,652 11,606 19,481 18,551 26,793 32,865 31,481 19,855 11,488 8,839 10,291

Modified Flows 2020 – Up per Snak e River Basin D-5

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D-6 Modified Flows 2020 – Upper Snake River Basin